1247953265 has 16 divisors (see below), whose sum is σ = 1622647488. Its totient is φ = 915903936.

The previous prime is 1247953199. The next prime is 1247953271. The reversal of 1247953265 is 5623597421.

It is a cyclic number.

It is not a de Polignac number, because 1247953265 - 2¹⁰ = 1247952241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48299 + ... + 69488.

It is an arithmetic number, because the mean of its divisors is an integer number (101415468).

Almost surely, 2^1247953265 is an apocalyptic number.

It is an amenable number.

1247953265 is a deficient number, since it is larger than the sum of its proper divisors (374694223).

1247953265 is a wasteful number, since it uses less digits than its factorization.

1247953265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117968.

The product of its digits is 453600, while the sum is 44.

The square root of 1247953265 is about 35326.3819970288. The cubic root of 1247953265 is about 1076.6290829099.

The spelling of 1247953265 in words is "one billion, two hundred forty-seven million, nine hundred fifty-three thousand, two hundred sixty-five".