1265588213 has 4 divisors (see below), whose sum is σ = 1268298720. Its totient is φ = 1262877708.

The previous prime is 1265588201. The next prime is 1265588221. The reversal of 1265588213 is 3128855621.

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: 3128855621 = 3853 ⋅812057.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265588213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265888213) 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, 1354553 + ... + 1355486.

It is an arithmetic number, because the mean of its divisors is an integer number (317074680).

Almost surely, 2^1265588213 is an apocalyptic number.

It is an amenable number.

1265588213 is a deficient number, since it is larger than the sum of its proper divisors (2710507).

1265588213 is an equidigital number, since it uses as much as digits as its factorization.

1265588213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2710506.

The product of its digits is 115200, while the sum is 41.

The square root of 1265588213 is about 35575.1066477671. The cubic root of 1265588213 is about 1081.6766974246.

The spelling of 1265588213 in words is "one billion, two hundred sixty-five million, five hundred eighty-eight thousand, two hundred thirteen".