265413121 has 2 divisors, whose sum is σ = 265413122. Its totient is φ = 265413120.

The previous prime is 265413119. The next prime is 265413139. The reversal of 265413121 is 121314562.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140778225 + 124634896 = 11865^2 + 11164^2 .

It is a cyclic number.

It is not a de Polignac number, because 265413121 - 2¹ = 265413119 is a prime.

Together with 265413119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (265413521) 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, 132706560 + 132706561.

It is an arithmetic number, because the mean of its divisors is an integer number (132706561).

Almost surely, 2^265413121 is an apocalyptic number.

It is an amenable number.

265413121 is a deficient number, since it is larger than the sum of its proper divisors (1).

265413121 is an equidigital number, since it uses as much as digits as its factorization.

265413121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 265413121 is about 16291.5045652635. The cubic root of 265413121 is about 642.6494343730.

Adding to 265413121 its reverse (121314562), we get a palindrome (386727683).

The spelling of 265413121 in words is "two hundred sixty-five million, four hundred thirteen thousand, one hundred twenty-one".