231364721 has 6 divisors (see below), whose sum is σ = 269138610. Its totient is φ = 198312576.

The previous prime is 231364711. The next prime is 231364759. The reversal of 231364721 is 127463132.

It is a happy number.

231364721 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 only one way, i.e., 224400400 + 6964321 = 14980^2 + 2639^2 .

It is not a de Polignac number, because 231364721 - 2⁶ = 231364657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231364711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2360816 + ... + 2360913.

It is an arithmetic number, because the mean of its divisors is an integer number (44856435).

Almost surely, 2^231364721 is an apocalyptic number.

It is an amenable number.

231364721 is a deficient number, since it is larger than the sum of its proper divisors (37773889).

231364721 is an equidigital number, since it uses as much as digits as its factorization.

231364721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4721743 (or 4721736 counting only the distinct ones).

The product of its digits is 6048, while the sum is 29.

The square root of 231364721 is about 15210.6778612920. The cubic root of 231364721 is about 613.9019965810.

The spelling of 231364721 in words is "two hundred thirty-one million, three hundred sixty-four thousand, seven hundred twenty-one".