265615121 has 2 divisors, whose sum is σ = 265615122. Its totient is φ = 265615120.

The previous prime is 265615111. The next prime is 265615127. The reversal of 265615121 is 121516562.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180606721 + 85008400 = 13439^2 + 9220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265615121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (265615127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132807560 + 132807561.

It is an arithmetic number, because the mean of its divisors is an integer number (132807561).

Almost surely, 2^265615121 is an apocalyptic number.

It is an amenable number.

265615121 is a deficient number, since it is larger than the sum of its proper divisors (1).

265615121 is an equidigital number, since it uses as much as digits as its factorization.

265615121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 265615121 is about 16297.7029363036. The cubic root of 265615121 is about 642.8124284079.

The spelling of 265615121 in words is "two hundred sixty-five million, six hundred fifteen thousand, one hundred twenty-one".