1265268331 has 4 divisors (see below), whose sum is σ = 1266227464. Its totient is φ = 1264309200.

The previous prime is 1265268313. The next prime is 1265268359. The reversal of 1265268331 is 1338625621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1338625621 = 109 ⋅12280969.

It is a cyclic number.

It is not a de Polignac number, because 1265268331 - 2¹⁵ = 1265235563 is a prime.

It is a super-2 number, since 2×1265268331² = 3201807898863051122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265268371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477585 + ... + 480226.

It is an arithmetic number, because the mean of its divisors is an integer number (316556866).

Almost surely, 2^1265268331 is an apocalyptic number.

1265268331 is a deficient number, since it is larger than the sum of its proper divisors (959133).

1265268331 is an equidigital number, since it uses as much as digits as its factorization.

1265268331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959132.

The product of its digits is 51840, while the sum is 37.

The square root of 1265268331 is about 35570.6104951827. The cubic root of 1265268331 is about 1081.5855571791.

The spelling of 1265268331 in words is "one billion, two hundred sixty-five million, two hundred sixty-eight thousand, three hundred thirty-one".