231408491 has 2 divisors, whose sum is σ = 231408492. Its totient is φ = 231408490.

The previous prime is 231408479. The next prime is 231408517. The reversal of 231408491 is 194804132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231408491 - 2¹⁸ = 231146347 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231408421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115704245 + 115704246.

It is an arithmetic number, because the mean of its divisors is an integer number (115704246).

Almost surely, 2^231408491 is an apocalyptic number.

231408491 is a deficient number, since it is larger than the sum of its proper divisors (1).

231408491 is an equidigital number, since it uses as much as digits as its factorization.

231408491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 231408491 is about 15212.1165851436. The cubic root of 231408491 is about 613.9407071732.

The spelling of 231408491 in words is "two hundred thirty-one million, four hundred eight thousand, four hundred ninety-one".