131199881 has 2 divisors, whose sum is σ = 131199882. Its totient is φ = 131199880.

The previous prime is 131199853. The next prime is 131199911. The reversal of 131199881 is 188991131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84345856 + 46854025 = 9184^2 + 6845^2 .

It is a cyclic number.

It is not a de Polignac number, because 131199881 - 2²⁶ = 64091017 is a prime.

It is a super-2 number, since 2×131199881² = 34426817548828322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131199811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65599940 + 65599941.

It is an arithmetic number, because the mean of its divisors is an integer number (65599941).

Almost surely, 2^131199881 is an apocalyptic number.

It is an amenable number.

131199881 is a deficient number, since it is larger than the sum of its proper divisors (1).

131199881 is an equidigital number, since it uses as much as digits as its factorization.

131199881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 41.

The square root of 131199881 is about 11454.2516560446. The cubic root of 131199881 is about 508.1334834811.

The spelling of 131199881 in words is "one hundred thirty-one million, one hundred ninety-nine thousand, eight hundred eighty-one".