51137581 has 16 divisors (see below), whose sum is σ = 60049728. Its totient is φ = 43027200.

The previous prime is 51137573. The next prime is 51137587. The reversal of 51137581 is 18573115.

It is a cyclic number.

It is not a de Polignac number, because 51137581 - 2³ = 51137573 is a prime.

It is a super-2 number, since 2×51137581² = 5230104381063122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51137587) 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 in 15 ways as a sum of consecutive naturals, for example, 9166 + ... + 13648.

It is an arithmetic number, because the mean of its divisors is an integer number (3753108).

Almost surely, 2^51137581 is an apocalyptic number.

It is an amenable number.

51137581 is a deficient number, since it is larger than the sum of its proper divisors (8912147).

51137581 is a wasteful number, since it uses less digits than its factorization.

51137581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572.

The product of its digits is 4200, while the sum is 31.

The square root of 51137581 is about 7151.0545376189. The cubic root of 51137581 is about 371.1761477572.

The spelling of 51137581 in words is "fifty-one million, one hundred thirty-seven thousand, five hundred eighty-one".