231404279 has 2 divisors, whose sum is σ = 231404280. Its totient is φ = 231404278.

The previous prime is 231404269. The next prime is 231404317. The reversal of 231404279 is 972404132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231404279 - 2¹⁶ = 231338743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231404209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115702139 + 115702140.

It is an arithmetic number, because the mean of its divisors is an integer number (115702140).

Almost surely, 2^231404279 is an apocalyptic number.

231404279 is a deficient number, since it is larger than the sum of its proper divisors (1).

231404279 is an equidigital number, since it uses as much as digits as its factorization.

231404279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 231404279 is about 15211.9781422404. The cubic root of 231404279 is about 613.9369822538.

The spelling of 231404279 in words is "two hundred thirty-one million, four hundred four thousand, two hundred seventy-nine".