231372409 has 4 divisors (see below), whose sum is σ = 232252416. Its totient is φ = 230492404.

The previous prime is 231372403. The next prime is 231372419. The reversal of 231372409 is 904273132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231372409 - 2¹⁷ = 231241337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231372403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439609 + ... + 440134.

It is an arithmetic number, because the mean of its divisors is an integer number (58063104).

Almost surely, 2^231372409 is an apocalyptic number.

It is an amenable number.

231372409 is a deficient number, since it is larger than the sum of its proper divisors (880007).

231372409 is an equidigital number, since it uses as much as digits as its factorization.

231372409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880006.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 231372409 is about 15210.9305763980. The cubic root of 231372409 is about 613.9087962726.

The spelling of 231372409 in words is "two hundred thirty-one million, three hundred seventy-two thousand, four hundred nine".