51231015 has 32 divisors (see below), whose sum is σ = 99360000. Its totient is φ = 24838560.

The previous prime is 51231007. The next prime is 51231073. The reversal of 51231015 is 51013215.

It is not a de Polignac number, because 51231015 - 2³ = 51231007 is a prime.

It is a congruent 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, 15765 + ... + 18734.

It is an arithmetic number, because the mean of its divisors is an integer number (3105000).

Almost surely, 2^51231015 is an apocalyptic number.

51231015 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51231015 is a deficient number, since it is larger than the sum of its proper divisors (48128985).

51231015 is a wasteful number, since it uses less digits than its factorization.

51231015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34524 (or 34518 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51231015 is about 7157.5844389012. The cubic root of 51231015 is about 371.4020701365.

The spelling of 51231015 in words is "fifty-one million, two hundred thirty-one thousand, fifteen".