264979921 has 2 divisors, whose sum is σ = 264979922. Its totient is φ = 264979920.

The previous prime is 264979877. The next prime is 264979927. The reversal of 264979921 is 129979462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179158225 + 85821696 = 13385^2 + 9264^2 .

It is a cyclic number.

It is not a de Polignac number, because 264979921 - 2²¹ = 262882769 is a prime.

It is not a weakly prime, because it can be changed into another prime (264979927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132489960 + 132489961.

It is an arithmetic number, because the mean of its divisors is an integer number (132489961).

Almost surely, 2^264979921 is an apocalyptic number.

It is an amenable number.

264979921 is a deficient number, since it is larger than the sum of its proper divisors (1).

264979921 is an equidigital number, since it uses as much as digits as its factorization.

264979921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 264979921 is about 16278.2038628345. The cubic root of 264979921 is about 642.2996057301.

The spelling of 264979921 in words is "two hundred sixty-four million, nine hundred seventy-nine thousand, nine hundred twenty-one".