51900031890 has 48 divisors (see below), whose sum is σ = 154217239488. Its totient is φ = 11862864288.

The previous prime is 51900031879. The next prime is 51900031903. The reversal of 51900031890 is 9813000915.

It is a happy number.

51900031890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51900031890² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41189872 + ... + 41191131.

It is an arithmetic number, because the mean of its divisors is an integer number (3212859156).

Almost surely, 2^51900031890 is an apocalyptic number.

51900031890 is an abundant number, since it is smaller than the sum of its proper divisors (102317207598).

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

51900031890 is a wasteful number, since it uses less digits than its factorization.

51900031890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82381023 (or 82381020 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 51900031890 in words is "fifty-one billion, nine hundred million, thirty-one thousand, eight hundred ninety".