231511215253 has 4 divisors (see below), whose sum is σ = 241576920288. Its totient is φ = 221445510220.

The previous prime is 231511215191. The next prime is 231511215269. The reversal of 231511215253 is 352512115132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231511215253 - 2²¹ = 231509118101 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231511515253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5032852483 + ... + 5032852528.

It is an arithmetic number, because the mean of its divisors is an integer number (60394230072).

Almost surely, 2^231511215253 is an apocalyptic number.

231511215253 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

231511215253 is a deficient number, since it is larger than the sum of its proper divisors (10065705035).

231511215253 is a wasteful number, since it uses less digits than its factorization.

231511215253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10065705034.

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

The spelling of 231511215253 in words is "two hundred thirty-one billion, five hundred eleven million, two hundred fifteen thousand, two hundred fifty-three".