1311290931 has 8 divisors (see below), whose sum is σ = 1749049344. Its totient is φ = 873863240.

The previous prime is 1311290921. The next prime is 1311290933. The reversal of 1311290931 is 1390921131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311290931 - 2⁶ = 1311290867 is a prime.

It is a super-2 number, since 2×1311290931² = 3438967811445693522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311290933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73275 + ... + 89396.

It is an arithmetic number, because the mean of its divisors is an integer number (218631168).

Almost surely, 2^1311290931 is an apocalyptic number.

1311290931 is a deficient number, since it is larger than the sum of its proper divisors (437758413).

1311290931 is a wasteful number, since it uses less digits than its factorization.

1311290931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165361.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 1311290931 is about 36211.7512832506. The cubic root of 1311290931 is about 1094.5434822664.

It can be divided in two parts, 131 and 1290931, that multiplied together give a palindrome (169111961).

The spelling of 1311290931 in words is "one billion, three hundred eleven million, two hundred ninety thousand, nine hundred thirty-one".