265105921 has 2 divisors, whose sum is σ = 265105922. Its totient is φ = 265105920.

The previous prime is 265105913. The next prime is 265105933. The reversal of 265105921 is 129501562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258855921 + 6250000 = 16089^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 265105921 - 2³ = 265105913 is a prime.

It is a super-2 number, since 2×265105921² = 140562298698516482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (265135921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132552960 + 132552961.

It is an arithmetic number, because the mean of its divisors is an integer number (132552961).

Almost surely, 2^265105921 is an apocalyptic number.

It is an amenable number.

265105921 is a deficient number, since it is larger than the sum of its proper divisors (1).

265105921 is an equidigital number, since it uses as much as digits as its factorization.

265105921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 265105921 is about 16282.0736087269. The cubic root of 265105921 is about 642.4013957397.

The spelling of 265105921 in words is "two hundred sixty-five million, one hundred five thousand, nine hundred twenty-one".