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51920029 = 728326209
BaseRepresentation
bin1100011000001…
…1110010011101
310121200210220001
43012003302131
5101242420104
65052454301
71200212230
oct306036235
9117623801
1051920029
1127342317
121547a391
13a9ab315
146c77417
154858aa4
hex3183c9d

51920029 has 8 divisors (see below), whose sum is σ = 59549120. Its totient is φ = 44343936.

The previous prime is 51920021. The next prime is 51920041. The reversal of 51920029 is 92002915.

51920029 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51920029 - 23 = 51920021 is a prime.

It is a super-2 number, since 2×519200292 = 5391378822721682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51919979 and 51920006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51920021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11124 + ... + 15085.

It is an arithmetic number, because the mean of its divisors is an integer number (7443640).

Almost surely, 251920029 is an apocalyptic number.

It is an amenable number.

51920029 is a deficient number, since it is larger than the sum of its proper divisors (7629091).

51920029 is a wasteful number, since it uses less digits than its factorization.

51920029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26499.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 51920029 is about 7205.5554261972. Note that the first 3 decimals coincide. The cubic root of 51920029 is about 373.0596760675.

The spelling of 51920029 in words is "fifty-one million, nine hundred twenty thousand, twenty-nine".

Divisors: 1 7 283 1981 26209 183463 7417147 51920029