1265015253 has 4 divisors (see below), whose sum is σ = 1686687008. Its totient is φ = 843343500.

The previous prime is 1265015243. The next prime is 1265015261. The reversal of 1265015253 is 3525105621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1265015253 - 2²² = 1260820949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1265015253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265015243) 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 in 3 ways as a sum of consecutive naturals, for example, 210835873 + ... + 210835878.

It is an arithmetic number, because the mean of its divisors is an integer number (421671752).

Almost surely, 2^1265015253 is an apocalyptic number.

It is an amenable number.

1265015253 is a deficient number, since it is larger than the sum of its proper divisors (421671755).

1265015253 is an equidigital number, since it uses as much as digits as its factorization.

1265015253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421671754.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1265015253 is about 35567.0529141789. The cubic root of 1265015253 is about 1081.5134397331.

The spelling of 1265015253 in words is "one billion, two hundred sixty-five million, fifteen thousand, two hundred fifty-three".