1215172570531 has 12 divisors (see below), whose sum is σ = 1296495064720. Its totient is φ = 1138697481600.

The previous prime is 1215172570477. The next prime is 1215172570537. The reversal of 1215172570531 is 1350752715121.

It is not a de Polignac number, because 1215172570531 - 2⁹ = 1215172570019 is a prime.

It is a super-2 number, since 2×1215172570531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215172570537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9114495 + ... + 9246856.

Almost surely, 2^{1215172570531} is an apocalyptic number.

1215172570531 is a deficient number, since it is larger than the sum of its proper divisors (81322494189).

1215172570531 is a wasteful number, since it uses less digits than its factorization.

1215172570531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18361614 (or 18361597 counting only the distinct ones).

The product of its (nonzero) digits is 73500, while the sum is 40.

The spelling of 1215172570531 in words is "one trillion, two hundred fifteen billion, one hundred seventy-two million, five hundred seventy thousand, five hundred thirty-one".