131181881 has 2 divisors, whose sum is σ = 131181882. Its totient is φ = 131181880.

The previous prime is 131181859. The next prime is 131181889. The reversal of 131181881 is 188181131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122301481 + 8880400 = 11059^2 + 2980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131181881 is a prime.

It is a super-2 number, since 2×131181881² = 34417371805396322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131181889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65590940 + 65590941.

It is an arithmetic number, because the mean of its divisors is an integer number (65590941).

Almost surely, 2^131181881 is an apocalyptic number.

It is an amenable number.

131181881 is a deficient number, since it is larger than the sum of its proper divisors (1).

131181881 is an equidigital number, since it uses as much as digits as its factorization.

131181881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 32.

The square root of 131181881 is about 11453.4658946539. The cubic root of 131181881 is about 508.1102445855.

The spelling of 131181881 in words is "one hundred thirty-one million, one hundred eighty-one thousand, eight hundred eighty-one".