51531344313515 has 16 divisors (see below), whose sum is σ = 67459412498400. Its totient is φ = 37477231249920.

The previous prime is 51531344313473. The next prime is 51531344313571.

51531344313515 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51531344313515 - 2¹⁰ = 51531344312491 is a prime.

It is a super-2 number, since 2×51531344313515² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20717411 + ... + 23071059.

It is an arithmetic number, because the mean of its divisors is an integer number (4216213281150).

Almost surely, 2^{51531344313515} is an apocalyptic number.

51531344313515 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51531344313515 is a deficient number, since it is larger than the sum of its proper divisors (15928068184885).

51531344313515 is a wasteful number, since it uses less digits than its factorization.

51531344313515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751742.

The product of its digits is 810000, while the sum is 44.

It can be divided in two parts, 5153134 and 4313515, that added together give a palindrome (9466649).

The spelling of 51531344313515 in words is "fifty-one trillion, five hundred thirty-one billion, three hundred forty-four million, three hundred thirteen thousand, five hundred fifteen".