51232052391 has 24 divisors (see below), whose sum is σ = 74169987840. Its totient is φ = 31441396896.

The previous prime is 51232052383. The next prime is 51232052393. The reversal of 51232052391 is 19325023215.

It is not a de Polignac number, because 51232052391 - 2³ = 51232052383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51232052393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48400 + ... + 323738.

It is an arithmetic number, because the mean of its divisors is an integer number (3090416160).

Almost surely, 2^51232052391 is an apocalyptic number.

51232052391 is a deficient number, since it is larger than the sum of its proper divisors (22937935449).

51232052391 is a wasteful number, since it uses less digits than its factorization.

51232052391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275735 (or 275722 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 51232052391 in words is "fifty-one billion, two hundred thirty-two million, fifty-two thousand, three hundred ninety-one".