1312985269 has 4 divisors (see below), whose sum is σ = 1319208160. Its totient is φ = 1306762380.

The previous prime is 1312985257. The next prime is 1312985273. The reversal of 1312985269 is 9625892131.

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: 9625892131 = 191 ⋅50397341.

It is a cyclic number.

It is not a de Polignac number, because 1312985269 - 2¹⁷ = 1312854197 is a prime.

It is a super-2 number, since 2×1312985269² = 3447860633222004722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312985969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3111129 + ... + 3111550.

It is an arithmetic number, because the mean of its divisors is an integer number (329802040).

Almost surely, 2^1312985269 is an apocalyptic number.

It is an amenable number.

1312985269 is a deficient number, since it is larger than the sum of its proper divisors (6222891).

1312985269 is an equidigital number, since it uses as much as digits as its factorization.

1312985269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6222890.

The product of its digits is 233280, while the sum is 46.

The square root of 1312985269 is about 36235.1385950158. The cubic root of 1312985269 is about 1095.0147045279.

The spelling of 1312985269 in words is "one billion, three hundred twelve million, nine hundred eighty-five thousand, two hundred sixty-nine".