51745521 has 8 divisors (see below), whose sum is σ = 69639264. Its totient is φ = 34174400.

The previous prime is 51745517. The next prime is 51745549. The reversal of 51745521 is 12554715.

51745521 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 a cyclic number.

It is not a de Polignac number, because 51745521 - 2² = 51745517 is a prime.

It is a super-2 number, since 2×51745521² = 5355197887122882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51745571) 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, 80280 + ... + 80921.

It is an arithmetic number, because the mean of its divisors is an integer number (8704908).

Almost surely, 2^51745521 is an apocalyptic number.

It is an amenable number.

51745521 is a deficient number, since it is larger than the sum of its proper divisors (17893743).

51745521 is a wasteful number, since it uses less digits than its factorization.

51745521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161311.

The product of its digits is 7000, while the sum is 30.

The square root of 51745521 is about 7193.4359662125. The cubic root of 51745521 is about 372.6412442758.

The spelling of 51745521 in words is "fifty-one million, seven hundred forty-five thousand, five hundred twenty-one".