268508921 has 2 divisors, whose sum is σ = 268508922. Its totient is φ = 268508920.

The previous prime is 268508917. The next prime is 268508927. The reversal of 268508921 is 129805862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207043321 + 61465600 = 14389^2 + 7840^2 .

It is a cyclic number.

It is not a de Polignac number, because 268508921 - 2² = 268508917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (268508927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134254460 + 134254461.

It is an arithmetic number, because the mean of its divisors is an integer number (134254461).

Almost surely, 2^268508921 is an apocalyptic number.

It is an amenable number.

268508921 is a deficient number, since it is larger than the sum of its proper divisors (1).

268508921 is an equidigital number, since it uses as much as digits as its factorization.

268508921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 268508921 is about 16386.2418205030. The cubic root of 268508921 is about 645.1384203052.

The spelling of 268508921 in words is "two hundred sixty-eight million, five hundred eight thousand, nine hundred twenty-one".