51731058315738 has 16 divisors (see below), whose sum is σ = 104411310363360. Its totient is φ = 17085487149936.

The previous prime is 51731058315731. The next prime is 51731058315767. The reversal of 51731058315738 is 83751385013715.

It is a happy number.

It is a super-2 number, since 2×51731058315738² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51731058315731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39549738120 + ... + 39549739427.

It is an arithmetic number, because the mean of its divisors is an integer number (6525706897710).

Almost surely, 2^{51731058315738} is an apocalyptic number.

51731058315738 is an abundant number, since it is smaller than the sum of its proper divisors (52680252047622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51731058315738 is a wasteful number, since it uses less digits than its factorization.

51731058315738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79099477661.

The product of its (nonzero) digits is 10584000, while the sum is 57.

The spelling of 51731058315738 in words is "fifty-one trillion, seven hundred thirty-one billion, fifty-eight million, three hundred fifteen thousand, seven hundred thirty-eight".