231604661 has 8 divisors (see below), whose sum is σ = 244053600. Its totient is φ = 219181680.

The previous prime is 231604621. The next prime is 231604697. The reversal of 231604661 is 166406132.

It is a happy number.

231604661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231604661 - 2¹⁴ = 231588277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231604601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13430 + ... + 25368.

It is an arithmetic number, because the mean of its divisors is an integer number (30506700).

Almost surely, 2^231604661 is an apocalyptic number.

It is an amenable number.

231604661 is a deficient number, since it is larger than the sum of its proper divisors (12448939).

231604661 is a wasteful number, since it uses less digits than its factorization.

231604661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12979.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 231604661 is about 15218.5630399194. The cubic root of 231604661 is about 614.1141417949.

The spelling of 231604661 in words is "two hundred thirty-one million, six hundred four thousand, six hundred sixty-one".