1311464781 has 12 divisors (see below), whose sum is σ = 2066550720. Its totient is φ = 794827080.

The previous prime is 1311464753. The next prime is 1311464789. The reversal of 1311464781 is 1874641131.

1311464781 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 4 + 647 + 8 + 1 = 666.

It is not a de Polignac number, because 1311464781 - 2⁶ = 1311464717 is a prime.

It is a super-2 number, since 2×1311464781² = 3439879743606755922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311464789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6623461 + ... + 6623658.

It is an arithmetic number, because the mean of its divisors is an integer number (172212560).

Almost surely, 2^1311464781 is an apocalyptic number.

1311464781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1311464781 is a deficient number, since it is larger than the sum of its proper divisors (755085939).

1311464781 is a wasteful number, since it uses less digits than its factorization.

1311464781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13247136 (or 13247133 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 1311464781 is about 36214.1516675457. The cubic root of 1311464781 is about 1094.5918513891.

The spelling of 1311464781 in words is "one billion, three hundred eleven million, four hundred sixty-four thousand, seven hundred eighty-one".