231164509 has 2 divisors, whose sum is σ = 231164510. Its totient is φ = 231164508.

The previous prime is 231164497. The next prime is 231164579. The reversal of 231164509 is 905461132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189200025 + 41964484 = 13755^2 + 6478^2 .

It is a cyclic number.

It is not a de Polignac number, because 231164509 - 2⁵ = 231164477 is a prime.

It is a super-2 number, since 2×231164509² = 106874060442422162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231164579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115582254 + 115582255.

It is an arithmetic number, because the mean of its divisors is an integer number (115582255).

Almost surely, 2^231164509 is an apocalyptic number.

It is an amenable number.

231164509 is a deficient number, since it is larger than the sum of its proper divisors (1).

231164509 is an equidigital number, since it uses as much as digits as its factorization.

231164509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 231164509 is about 15204.0951391393. The cubic root of 231164509 is about 613.7248649700.

The spelling of 231164509 in words is "two hundred thirty-one million, one hundred sixty-four thousand, five hundred nine".