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71407381 is a prime number
BaseRepresentation
bin1000100000110…
…01011100010101
311222100212111211
410100121130111
5121240014011
611030301421
71524644533
oct420313425
9158325454
1071407381
1137342471
121bab7871
1311a422b6
1496ab153
156407b21
hex4419715

71407381 has 2 divisors, whose sum is σ = 71407382. Its totient is φ = 71407380.

The previous prime is 71407379. The next prime is 71407411. The reversal of 71407381 is 18370417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41486481 + 29920900 = 6441^2 + 5470^2 .

It is a cyclic number.

It is not a de Polignac number, because 71407381 - 21 = 71407379 is a prime.

It is a super-2 number, since 2×714073812 = 10198028122558322, which contains 22 as substring.

Together with 71407379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71407321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35703690 + 35703691.

It is an arithmetic number, because the mean of its divisors is an integer number (35703691).

Almost surely, 271407381 is an apocalyptic number.

It is an amenable number.

71407381 is a deficient number, since it is larger than the sum of its proper divisors (1).

71407381 is an equidigital number, since it uses as much as digits as its factorization.

71407381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 71407381 is about 8450.2888116324. The cubic root of 71407381 is about 414.8722324053.

Adding to 71407381 its reverse (18370417), we get a palindrome (89777798).

The spelling of 71407381 in words is "seventy-one million, four hundred seven thousand, three hundred eighty-one".