264620261 has 2 divisors, whose sum is σ = 264620262. Its totient is φ = 264620260.

The previous prime is 264620233. The next prime is 264620269. The reversal of 264620261 is 162026462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256320100 + 8300161 = 16010^2 + 2881^2 .

It is a cyclic number.

It is not a de Polignac number, because 264620261 - 2¹⁴ = 264603877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264620269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132310130 + 132310131.

It is an arithmetic number, because the mean of its divisors is an integer number (132310131).

Almost surely, 2^264620261 is an apocalyptic number.

It is an amenable number.

264620261 is a deficient number, since it is larger than the sum of its proper divisors (1).

264620261 is an equidigital number, since it uses as much as digits as its factorization.

264620261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 264620261 is about 16267.1528240193. The cubic root of 264620261 is about 642.0088741766.

The spelling of 264620261 in words is "two hundred sixty-four million, six hundred twenty thousand, two hundred sixty-one".