268833991 has 2 divisors, whose sum is σ = 268833992. Its totient is φ = 268833990.

The previous prime is 268833947. The next prime is 268833997. The reversal of 268833991 is 199338862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268833991 - 2¹⁵ = 268801223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268833997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134416995 + 134416996.

It is an arithmetic number, because the mean of its divisors is an integer number (134416996).

Almost surely, 2^268833991 is an apocalyptic number.

268833991 is a deficient number, since it is larger than the sum of its proper divisors (1).

268833991 is an equidigital number, since it uses as much as digits as its factorization.

268833991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The square root of 268833991 is about 16396.1578121217. The cubic root of 268833991 is about 645.3986606626.

The spelling of 268833991 in words is "two hundred sixty-eight million, eight hundred thirty-three thousand, nine hundred ninety-one".