51212313690 has 64 divisors (see below), whose sum is σ = 123628032000. Its totient is φ = 13576901184.

The previous prime is 51212313683. The next prime is 51212313701. The reversal of 51212313690 is 9631321215.

It is a super-2 number, since 2×51212313690² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9447801 + ... + 9453219.

It is an arithmetic number, because the mean of its divisors is an integer number (1931688000).

Almost surely, 2^51212313690 is an apocalyptic number.

51212313690 is an abundant number, since it is smaller than the sum of its proper divisors (72415718310).

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

51212313690 is a wasteful number, since it uses less digits than its factorization.

51212313690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7211.

The product of its (nonzero) digits is 9720, while the sum is 33.

The spelling of 51212313690 in words is "fifty-one billion, two hundred twelve million, three hundred thirteen thousand, six hundred ninety".