231513516 has 36 divisors (see below), whose sum is σ = 630232512. Its totient is φ = 71234784.

The previous prime is 231513481. The next prime is 231513521. The reversal of 231513516 is 615315132.

231513516 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 231513516.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246876 + ... + 247811.

Almost surely, 2^231513516 is an apocalyptic number.

231513516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

231513516 is an abundant number, since it is smaller than the sum of its proper divisors (398718996).

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

231513516 is a wasteful number, since it uses less digits than its factorization.

231513516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494710 (or 494705 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 231513516 is about 15215.5682115391. The cubic root of 231513516 is about 614.0335723490.

Adding to 231513516 its reverse (615315132), we get a palindrome (846828648).

The spelling of 231513516 in words is "two hundred thirty-one million, five hundred thirteen thousand, five hundred sixteen".