1312261326 has 12 divisors (see below), whose sum is σ = 2843232912. Its totient is φ = 437420436.

The previous prime is 1312261309. The next prime is 1312261361. The reversal of 1312261326 is 6231622131.

1312261326 is a `hidden beast` number, since 1 + 3 + 1 + 22 + 613 + 26 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312261326.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36451686 + ... + 36451721.

It is an arithmetic number, because the mean of its divisors is an integer number (236936076).

Almost surely, 2^1312261326 is an apocalyptic number.

1312261326 is an abundant number, since it is smaller than the sum of its proper divisors (1530971586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312261326 is a wasteful number, since it uses less digits than its factorization.

1312261326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72903415 (or 72903412 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1312261326 is about 36225.1477015622. The cubic root of 1312261326 is about 1094.8134141328.

Adding to 1312261326 its reverse (6231622131), we get a palindrome (7543883457).

The spelling of 1312261326 in words is "one billion, three hundred twelve million, two hundred sixty-one thousand, three hundred twenty-six".