1516391287631 has 8 divisors (see below), whose sum is σ = 1654495497984. Its totient is φ = 1378328820120.

The previous prime is 1516391287529. The next prime is 1516391287667. The reversal of 1516391287631 is 1367821936151.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1516391287631 is a prime.

It is a super-2 number, since 2×1516391287631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1516391287331) 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, 10359725 + ... + 10505078.

It is an arithmetic number, because the mean of its divisors is an integer number (206811937248).

Almost surely, 2^{1516391287631} is an apocalyptic number.

1516391287631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1516391287631 is a deficient number, since it is larger than the sum of its proper divisors (138104210353).

1516391287631 is a wasteful number, since it uses less digits than its factorization.

1516391287631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20871421.

The product of its digits is 1632960, while the sum is 53.

The spelling of 1516391287631 in words is "one trillion, five hundred sixteen billion, three hundred ninety-one million, two hundred eighty-seven thousand, six hundred thirty-one".