268631999 has 2 divisors, whose sum is σ = 268632000. Its totient is φ = 268631998.

The previous prime is 268631981. The next prime is 268632031. The reversal of 268631999 is 999136862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 268631999 - 2²⁰ = 267583423 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 268631999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268631939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134315999 + 134316000.

It is an arithmetic number, because the mean of its divisors is an integer number (134316000).

Almost surely, 2^268631999 is an apocalyptic number.

268631999 is a deficient number, since it is larger than the sum of its proper divisors (1).

268631999 is an equidigital number, since it uses as much as digits as its factorization.

268631999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The square root of 268631999 is about 16389.9969188527. The cubic root of 268631999 is about 645.2369772014.

The spelling of 268631999 in words is "two hundred sixty-eight million, six hundred thirty-one thousand, nine hundred ninety-nine".