265416521 has 2 divisors, whose sum is σ = 265416522. Its totient is φ = 265416520.

The previous prime is 265416517. The next prime is 265416533. The reversal of 265416521 is 125614562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265201225 + 215296 = 16285^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 265416521 - 2² = 265416517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (265416581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132708260 + 132708261.

It is an arithmetic number, because the mean of its divisors is an integer number (132708261).

Almost surely, 2^265416521 is an apocalyptic number.

It is an amenable number.

265416521 is a deficient number, since it is larger than the sum of its proper divisors (1).

265416521 is an equidigital number, since it uses as much as digits as its factorization.

265416521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 32.

The square root of 265416521 is about 16291.6089137936. The cubic root of 265416521 is about 642.6521785211.

The spelling of 265416521 in words is "two hundred sixty-five million, four hundred sixteen thousand, five hundred twenty-one".