51540103251 has 80 divisors (see below), whose sum is σ = 95179924224. Its totient is φ = 27065347776.

The previous prime is 51540103211. The next prime is 51540103253. The reversal of 51540103251 is 15230104515.

51540103251 is a `hidden beast` number, since 5 + 1 + 5 + 401 + 0 + 3 + 251 = 666.

It is not a de Polignac number, because 51540103251 - 2²³ = 51531714643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51540103253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1657816 + ... + 1688618.

Almost surely, 2^51540103251 is an apocalyptic number.

51540103251 is a deficient number, since it is larger than the sum of its proper divisors (43639820973).

51540103251 is a wasteful number, since it uses less digits than its factorization.

51540103251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31062 (or 31053 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 51540103251 its reverse (15230104515), we get a palindrome (66770207766).

The spelling of 51540103251 in words is "fifty-one billion, five hundred forty million, one hundred three thousand, two hundred fifty-one".