231399937 has 4 divisors (see below), whose sum is σ = 245011716. Its totient is φ = 217788160.

The previous prime is 231399929. The next prime is 231399967. The reversal of 231399937 is 739993132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127441521 + 103958416 = 11289^2 + 10196^2 .

It is a cyclic number.

It is not a de Polignac number, because 231399937 - 2³ = 231399929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231399907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6805864 + ... + 6805897.

It is an arithmetic number, because the mean of its divisors is an integer number (61252929).

Almost surely, 2^231399937 is an apocalyptic number.

It is an amenable number.

231399937 is a deficient number, since it is larger than the sum of its proper divisors (13611779).

231399937 is a wasteful number, since it uses less digits than its factorization.

231399937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13611778.

The product of its digits is 275562, while the sum is 46.

The square root of 231399937 is about 15211.8354250892. The cubic root of 231399937 is about 613.9331423204.

The spelling of 231399937 in words is "two hundred thirty-one million, three hundred ninety-nine thousand, nine hundred thirty-seven".