51731000581 has 16 divisors (see below), whose sum is σ = 55908360256. Its totient is φ = 47582246016.

The previous prime is 51731000567. The next prime is 51731000611. The reversal of 51731000581 is 18500013715.

It is a cyclic number.

It is not a de Polignac number, because 51731000581 - 2¹¹ = 51730998533 is a prime.

It is a super-2 number, since 2×51731000581² (a number of 22 digits) contains 22 as substring.

It is the 227445-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51731004581) by changing a digit.

It is a nontrivial repunit in base 227444.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4365841 + ... + 4377673.

It is an arithmetic number, because the mean of its divisors is an integer number (3494272516).

Almost surely, 2^51731000581 is an apocalyptic number.

It is an amenable number.

51731000581 is a deficient number, since it is larger than the sum of its proper divisors (4177359675).

51731000581 is a wasteful number, since it uses less digits than its factorization.

51731000581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13012.

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

The spelling of 51731000581 in words is "fifty-one billion, seven hundred thirty-one million, five hundred eighty-one", and thus it is an aban number.