231506645 has 16 divisors (see below), whose sum is σ = 281458800. Its totient is φ = 182784000.

The previous prime is 231506609. The next prime is 231506677. The reversal of 231506645 is 546605132.

231506645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 22819729 + 208686916 = 4777^2 + 14446^2 .

It is not a de Polignac number, because 231506645 - 2⁶ = 231506581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226235 + ... + 227255.

It is an arithmetic number, because the mean of its divisors is an integer number (17591175).

Almost surely, 2^231506645 is an apocalyptic number.

It is an amenable number.

231506645 is a deficient number, since it is larger than the sum of its proper divisors (49952155).

231506645 is a wasteful number, since it uses less digits than its factorization.

231506645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 231506645 is about 15215.3424213851. The cubic root of 231506645 is about 614.0274977340.

The spelling of 231506645 in words is "two hundred thirty-one million, five hundred six thousand, six hundred forty-five".