264736981 has 2 divisors, whose sum is σ = 264736982. Its totient is φ = 264736980.

The previous prime is 264736973. The next prime is 264736987. The reversal of 264736981 is 189637462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260305956 + 4431025 = 16134^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 264736981 - 2³ = 264736973 is a prime.

It is a super-2 number, since 2×264736981² = 140171338217988722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264736987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132368490 + 132368491.

It is an arithmetic number, because the mean of its divisors is an integer number (132368491).

Almost surely, 2^264736981 is an apocalyptic number.

It is an amenable number.

264736981 is a deficient number, since it is larger than the sum of its proper divisors (1).

264736981 is an equidigital number, since it uses as much as digits as its factorization.

264736981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 264736981 is about 16270.7400261943. The cubic root of 264736981 is about 642.1032537737.

The spelling of 264736981 in words is "two hundred sixty-four million, seven hundred thirty-six thousand, nine hundred eighty-one".