1265311245 has 32 divisors (see below), whose sum is σ = 2215825920. Its totient is φ = 611461440.

The previous prime is 1265311231. The next prime is 1265311253. The reversal of 1265311245 is 5421135621.

1265311245 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1265311245 - 2⁶ = 1265311181 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38166 + ... + 63144.

It is an arithmetic number, because the mean of its divisors is an integer number (69244560).

Almost surely, 2^1265311245 is an apocalyptic number.

1265311245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265311245 is a deficient number, since it is larger than the sum of its proper divisors (950514675).

1265311245 is a wasteful number, since it uses less digits than its factorization.

1265311245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25305.

The product of its digits is 7200, while the sum is 30.

The square root of 1265311245 is about 35571.2137127762. The cubic root of 1265311245 is about 1081.5977850565.

Adding to 1265311245 its reverse (5421135621), we get a palindrome (6686446866).

The spelling of 1265311245 in words is "one billion, two hundred sixty-five million, three hundred eleven thousand, two hundred forty-five".