231401279 has 2 divisors, whose sum is σ = 231401280. Its totient is φ = 231401278.

The previous prime is 231401249. The next prime is 231401333. The reversal of 231401279 is 972104132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231401279 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231401249) 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, 115700639 + 115700640.

It is an arithmetic number, because the mean of its divisors is an integer number (115700640).

Almost surely, 2^231401279 is an apocalyptic number.

231401279 is a deficient number, since it is larger than the sum of its proper divisors (1).

231401279 is an equidigital number, since it uses as much as digits as its factorization.

231401279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 231401279 is about 15211.8795354157. The cubic root of 231401279 is about 613.9343291497.

The spelling of 231401279 in words is "two hundred thirty-one million, four hundred one thousand, two hundred seventy-nine".