215125243531 has 16 divisors (see below), whose sum is σ = 236174635008. Its totient is φ = 194328072000.

The previous prime is 215125243523. The next prime is 215125243559. The reversal of 215125243531 is 135342521512.

It is a cyclic number.

It is not a de Polignac number, because 215125243531 - 2³ = 215125243523 is a prime.

It is a super-2 number, since 2×215125243531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215125243591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1162006 + ... + 1334356.

It is an arithmetic number, because the mean of its divisors is an integer number (14760914688).

Almost surely, 2^215125243531 is an apocalyptic number.

215125243531 is a deficient number, since it is larger than the sum of its proper divisors (21049391477).

215125243531 is a wasteful number, since it uses less digits than its factorization.

215125243531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173082.

The product of its digits is 36000, while the sum is 34.

The spelling of 215125243531 in words is "two hundred fifteen billion, one hundred twenty-five million, two hundred forty-three thousand, five hundred thirty-one".