265106521 has 2 divisors, whose sum is σ = 265106522. Its totient is φ = 265106520.

The previous prime is 265106497. The next prime is 265106539. The reversal of 265106521 is 125601562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265038400 + 68121 = 16280^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 265106521 - 2⁵ = 265106489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 265106521.

It is not a weakly prime, because it can be changed into another prime (265106561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132553260 + 132553261.

It is an arithmetic number, because the mean of its divisors is an integer number (132553261).

Almost surely, 2^265106521 is an apocalyptic number.

It is an amenable number.

265106521 is a deficient number, since it is larger than the sum of its proper divisors (1).

265106521 is an equidigital number, since it uses as much as digits as its factorization.

265106521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 265106521 is about 16282.0920338880. The cubic root of 265106521 is about 642.4018803769.

The spelling of 265106521 in words is "two hundred sixty-five million, one hundred six thousand, five hundred twenty-one".