1161881831 has 8 divisors (see below), whose sum is σ = 1271836944. Its totient is φ = 1052648320.

The previous prime is 1161881789. The next prime is 1161881857. The reversal of 1161881831 is 1381881611.

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 1161881831 - 2²² = 1157687527 is a prime.

It is a super-2 number, since 2×1161881831² = 2699938778415825122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161884831) 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, 177026 + ... + 183471.

It is an arithmetic number, because the mean of its divisors is an integer number (158979618).

Almost surely, 2^1161881831 is an apocalyptic number.

1161881831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1161881831 is a deficient number, since it is larger than the sum of its proper divisors (109955113).

1161881831 is a wasteful number, since it uses less digits than its factorization.

1161881831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360801.

The product of its digits is 9216, while the sum is 38.

The square root of 1161881831 is about 34086.3877669664. The cubic root of 1161881831 is about 1051.2854493964.

The spelling of 1161881831 in words is "one billion, one hundred sixty-one million, eight hundred eighty-one thousand, eight hundred thirty-one".