268991869 has 2 divisors, whose sum is σ = 268991870. Its totient is φ = 268991868.

The previous prime is 268991861. The next prime is 268991893. The reversal of 268991869 is 968199862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249956100 + 19035769 = 15810^2 + 4363^2 .

It is a cyclic number.

It is not a de Polignac number, because 268991869 - 2³ = 268991861 is a prime.

It is a super-2 number, since 2×268991869² = 144713251176226322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268991861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134495934 + 134495935.

It is an arithmetic number, because the mean of its divisors is an integer number (134495935).

Almost surely, 2^268991869 is an apocalyptic number.

It is an amenable number.

268991869 is a deficient number, since it is larger than the sum of its proper divisors (1).

268991869 is an equidigital number, since it uses as much as digits as its factorization.

268991869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 58.

The square root of 268991869 is about 16400.9715870737. The cubic root of 268991869 is about 645.5249769187.

The spelling of 268991869 in words is "two hundred sixty-eight million, nine hundred ninety-one thousand, eight hundred sixty-nine".