51937720931 has 4 divisors (see below), whose sum is σ = 52005261000. Its totient is φ = 51870180864.

The previous prime is 51937720903. The next prime is 51937720949. The reversal of 51937720931 is 13902773915.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51937720931 - 2¹⁰ = 51937719907 is a prime.

It is a super-2 number, since 2×51937720931² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51937720951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33768881 + ... + 33770418.

It is an arithmetic number, because the mean of its divisors is an integer number (13001315250).

Almost surely, 2^51937720931 is an apocalyptic number.

51937720931 is a deficient number, since it is larger than the sum of its proper divisors (67540069).

51937720931 is an equidigital number, since it uses as much as digits as its factorization.

51937720931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67540068.

The product of its (nonzero) digits is 357210, while the sum is 47.

The spelling of 51937720931 in words is "fifty-one billion, nine hundred thirty-seven million, seven hundred twenty thousand, nine hundred thirty-one".