1311661131 has 8 divisors (see below), whose sum is σ = 1907870784. Its totient is φ = 794946120.

The previous prime is 1311661093. The next prime is 1311661139.

1311661131 is nontrivially palindromic in base 10.

1311661131 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1311661131 - 2¹⁰ = 1311660107 is a prime.

It is a super-2 number, since 2×1311661131² = 3440909845152398322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311661139) 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, 19873621 + ... + 19873686.

It is an arithmetic number, because the mean of its divisors is an integer number (238483848).

Almost surely, 2^1311661131 is an apocalyptic number.

1311661131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1311661131 is a deficient number, since it is larger than the sum of its proper divisors (596209653).

1311661131 is a wasteful number, since it uses less digits than its factorization.

1311661131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39747321.

The product of its digits is 324, while the sum is 24.

The square root of 1311661131 is about 36216.8625228636. The cubic root of 1311661131 is about 1094.6464753963.

It can be divided in two parts, 13116 and 61131, that added together give a palindrome (74247).

The spelling of 1311661131 in words is "one billion, three hundred eleven million, six hundred sixty-one thousand, one hundred thirty-one".