231492399 has 4 divisors (see below), whose sum is σ = 308656536. Its totient is φ = 154328264.

The previous prime is 231492389. The next prime is 231492419. The reversal of 231492399 is 993294132.

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

It is a cyclic number.

It is not a de Polignac number, because 231492399 - 2¹¹ = 231490351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231492399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231492329) 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, 38582064 + ... + 38582069.

It is an arithmetic number, because the mean of its divisors is an integer number (77164134).

Almost surely, 2^231492399 is an apocalyptic number.

231492399 is a deficient number, since it is larger than the sum of its proper divisors (77164137).

231492399 is an equidigital number, since it uses as much as digits as its factorization.

231492399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77164136.

The product of its digits is 104976, while the sum is 42.

The square root of 231492399 is about 15214.8742682942. The cubic root of 231492399 is about 614.0149025374.

The spelling of 231492399 in words is "two hundred thirty-one million, four hundred ninety-two thousand, three hundred ninety-nine".