1265493313 has 4 divisors (see below), whose sum is σ = 1446278080. Its totient is φ = 1084708548.

The previous prime is 1265493287. The next prime is 1265493323. The reversal of 1265493313 is 3133945621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3133945621 = 37 ⋅84701233.

It is a de Polignac number, because none of the positive numbers 2^k-1265493313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265493323) 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, 90392373 + ... + 90392386.

It is an arithmetic number, because the mean of its divisors is an integer number (361569520).

Almost surely, 2^1265493313 is an apocalyptic number.

It is an amenable number.

1265493313 is a deficient number, since it is larger than the sum of its proper divisors (180784767).

1265493313 is an equidigital number, since it uses as much as digits as its factorization.

1265493313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180784766.

The product of its digits is 58320, while the sum is 37.

The square root of 1265493313 is about 35573.7728249338. The cubic root of 1265493313 is about 1081.6496602774.

The spelling of 1265493313 in words is "one billion, two hundred sixty-five million, four hundred ninety-three thousand, three hundred thirteen".