231372289 has 2 divisors, whose sum is σ = 231372290. Its totient is φ = 231372288.

The previous prime is 231372233. The next prime is 231372343. The reversal of 231372289 is 982273132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228161025 + 3211264 = 15105^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 231372289 - 2⁷ = 231372161 is a prime.

It is a super-2 number, since 2×231372289² = 107066272234199042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231372209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115686144 + 115686145.

It is an arithmetic number, because the mean of its divisors is an integer number (115686145).

Almost surely, 2^231372289 is an apocalyptic number.

It is an amenable number.

231372289 is a deficient number, since it is larger than the sum of its proper divisors (1).

231372289 is an equidigital number, since it uses as much as digits as its factorization.

231372289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 231372289 is about 15210.9266318657. The cubic root of 231372289 is about 613.9086901392.

The spelling of 231372289 in words is "two hundred thirty-one million, three hundred seventy-two thousand, two hundred eighty-nine".