51515132431 has 8 divisors (see below), whose sum is σ = 58982072960. Its totient is φ = 44075100888.

The previous prime is 51515132413. The next prime is 51515132447. The reversal of 51515132431 is 13423151515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51515132431 - 2³³ = 42925197839 is a prime.

It is a super-2 number, since 2×51515132431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51515132393 and 51515132402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515132411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6723141 + ... + 6730798.

It is an arithmetic number, because the mean of its divisors is an integer number (7372759120).

Almost surely, 2^51515132431 is an apocalyptic number.

51515132431 is a deficient number, since it is larger than the sum of its proper divisors (7466940529).

51515132431 is a wasteful number, since it uses less digits than its factorization.

51515132431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13454493.

The product of its digits is 9000, while the sum is 31.

Adding to 51515132431 its reverse (13423151515), we get a palindrome (64938283946).

The spelling of 51515132431 in words is "fifty-one billion, five hundred fifteen million, one hundred thirty-two thousand, four hundred thirty-one".