231615616 has 32 divisors (see below), whose sum is σ = 488568780. Its totient is φ = 108994560.

The previous prime is 231615611. The next prime is 231615619. The reversal of 231615616 is 616516132.

It can be written as a sum of positive squares in 2 ways, for example, as 222129216 + 9486400 = 14904^2 + 3080^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231615611) 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, 51045 + ... + 55396.

Almost surely, 2^231615616 is an apocalyptic number.

It is an amenable number.

231615616 is an abundant number, since it is smaller than the sum of its proper divisors (256953164).

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

231615616 is a wasteful number, since it uses less digits than its factorization.

231615616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106472 (or 106460 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 231615616 is about 15218.9229579494. The cubic root of 231615616 is about 614.1238242632.

The spelling of 231615616 in words is "two hundred thirty-one million, six hundred fifteen thousand, six hundred sixteen".