231937921 has 16 divisors (see below), whose sum is σ = 249359040. Its totient is φ = 215075520.

The previous prime is 231937913. The next prime is 231937949. The reversal of 231937921 is 129739132.

It is a happy number.

231937921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 231937921 - 2³ = 231937913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231937021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339246 + ... + 339928.

It is an arithmetic number, because the mean of its divisors is an integer number (15584940).

Almost surely, 2^231937921 is an apocalyptic number.

It is an amenable number.

231937921 is a deficient number, since it is larger than the sum of its proper divisors (17421119).

231937921 is a wasteful number, since it uses less digits than its factorization.

231937921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056.

The product of its digits is 20412, while the sum is 37.

The square root of 231937921 is about 15229.5082323757. The cubic root of 231937921 is about 614.4085538238.

The spelling of 231937921 in words is "two hundred thirty-one million, nine hundred thirty-seven thousand, nine hundred twenty-one".