51531621000 has 256 divisors, whose sum is σ = 164472422400. Its totient is φ = 13429728000.

The previous prime is 51531620989. The next prime is 51531621019. The reversal of 51531621000 is 12613515.

51531621000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24409945 + ... + 24412055.

It is an arithmetic number, because the mean of its divisors is an integer number (642470400).

Almost surely, 2^51531621000 is an apocalyptic number.

51531621000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51531621000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82236211200).

51531621000 is an abundant number, since it is smaller than the sum of its proper divisors (112940801400).

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

51531621000 is a wasteful number, since it uses less digits than its factorization.

51531621000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317 (or 2303 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 51531621000 in words is "fifty-one billion, five hundred thirty-one million, six hundred twenty-one thousand".