51115531400 has 24 divisors (see below), whose sum is σ = 118843610970. Its totient is φ = 20446212480.

The previous prime is 51115531367. The next prime is 51115531421. The reversal of 51115531400 is 413551115.

51115531400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 49808419684 + 1307111716 = 223178^2 + 36154^2 .

It is a super-2 number, since 2×51115531400² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51115531400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127788629 + ... + 127789028.

Almost surely, 2^51115531400 is an apocalyptic number.

51115531400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51115531400 is an abundant number, since it is smaller than the sum of its proper divisors (67728079570).

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

51115531400 is a wasteful number, since it uses less digits than its factorization.

51115531400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255577673 (or 255577664 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 26.

The spelling of 51115531400 in words is "fifty-one billion, one hundred fifteen million, five hundred thirty-one thousand, four hundred".