231606661 has 16 divisors (see below), whose sum is σ = 277240320. Its totient is φ = 190681920.

The previous prime is 231606653. The next prime is 231606667. The reversal of 231606661 is 166606132.

It is not a de Polignac number, because 231606661 - 2³ = 231606653 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 (231606667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7701 + ... + 22858.

It is an arithmetic number, because the mean of its divisors is an integer number (17327520).

Almost surely, 2^231606661 is an apocalyptic number.

It is an amenable number.

231606661 is a deficient number, since it is larger than the sum of its proper divisors (45633659).

231606661 is a wasteful number, since it uses less digits than its factorization.

231606661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30636.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 231606661 is about 15218.6287490036. The cubic root of 231606661 is about 614.1159094978.

The spelling of 231606661 in words is "two hundred thirty-one million, six hundred six thousand, six hundred sixty-one".