265531649 has 2 divisors, whose sum is σ = 265531650. Its totient is φ = 265531648.

The previous prime is 265531639. The next prime is 265531657. The reversal of 265531649 is 946135562.

265531649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265527025 + 4624 = 16295^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 265531649 - 2⁴ = 265531633 is a prime.

It is not a weakly prime, because it can be changed into another prime (265531639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132765824 + 132765825.

It is an arithmetic number, because the mean of its divisors is an integer number (132765825).

Almost surely, 2^265531649 is an apocalyptic number.

It is an amenable number.

265531649 is a deficient number, since it is larger than the sum of its proper divisors (1).

265531649 is an equidigital number, since it uses as much as digits as its factorization.

265531649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 41.

The square root of 265531649 is about 16295.1418833958. The cubic root of 265531649 is about 642.7450847761.

The spelling of 265531649 in words is "two hundred sixty-five million, five hundred thirty-one thousand, six hundred forty-nine".