1311296920 has 32 divisors (see below), whose sum is σ = 2952378000. Its totient is φ = 524170368.

The previous prime is 1311296893. The next prime is 1311296929. The reversal of 1311296920 is 296921131.

It is a super-2 number, since 2×1311296920² = 3438999224802972800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311296929) 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, 55006 + ... + 75154.

Almost surely, 2^1311296920 is an apocalyptic number.

1311296920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311296920 is an abundant number, since it is smaller than the sum of its proper divisors (1641081080).

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

1311296920 is a wasteful number, since it uses less digits than its factorization.

1311296920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21787 (or 21783 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1311296920 is about 36211.8339773064. The cubic root of 1311296920 is about 1094.5451486169.

The spelling of 1311296920 in words is "one billion, three hundred eleven million, two hundred ninety-six thousand, nine hundred twenty".