231521540610 has 16 divisors (see below), whose sum is σ = 555651697536. Its totient is φ = 61739077488.

The previous prime is 231521540609. The next prime is 231521540623. The reversal of 231521540610 is 16045125132.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 7717384687 = 231521540610 / (2 + 3 + 1 + 5 + 2 + 1 + 5 + 4 + 0 + 6 + 1 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3858692314 + ... + 3858692373.

It is an arithmetic number, because the mean of its divisors is an integer number (34728231096).

Almost surely, 2^231521540610 is an apocalyptic number.

231521540610 is an abundant number, since it is smaller than the sum of its proper divisors (324130156926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231521540610 is a wasteful number, since it uses less digits than its factorization.

231521540610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7717384697.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 231521540610 its reverse (16045125132), we get a palindrome (247566665742).

The spelling of 231521540610 in words is "two hundred thirty-one billion, five hundred twenty-one million, five hundred forty thousand, six hundred ten".