131181889 has 2 divisors, whose sum is σ = 131181890. Its totient is φ = 131181888.

The previous prime is 131181881. The next prime is 131181899. The reversal of 131181889 is 988181131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129777664 + 1404225 = 11392^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 131181889 - 2³ = 131181881 is a prime.

It is not a weakly prime, because it can be changed into another prime (131181881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65590944 + 65590945.

It is an arithmetic number, because the mean of its divisors is an integer number (65590945).

Almost surely, 2^131181889 is an apocalyptic number.

It is an amenable number.

131181889 is a deficient number, since it is larger than the sum of its proper divisors (1).

131181889 is an equidigital number, since it uses as much as digits as its factorization.

131181889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 40.

The square root of 131181889 is about 11453.4662438932. The cubic root of 131181889 is about 508.1102549144.

The spelling of 131181889 in words is "one hundred thirty-one million, one hundred eighty-one thousand, eight hundred eighty-nine".