131808881 has 2 divisors, whose sum is σ = 131808882.
Its totient is φ = 131808880.
The previous prime is 131808847. The next prime is 131808923. The reversal of 131808881 is 188808131.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 84474481 + 47334400 = 9191^2 + 6880^2
It is a cyclic number.
It is not a de Polignac number, because 131808881 - 214 = 131792497 is a prime.
It is a super-2 number, since 2×1318088812 = 34747162220944322, which contains 22 as substring.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (131808841) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65904440 + 65904441.
It is an arithmetic number, because the mean of its divisors is an integer number (65904441).
Almost surely, 2131808881 is an apocalyptic number.
It is an amenable number.
131808881 is a deficient number, since it is larger than the sum of its proper divisors (1).
131808881 is an equidigital number, since it uses as much as digits as its factorization.
131808881 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 12288, while the sum is 38.
The square root of 131808881 is about 11480.8048933862.
The cubic root of 131808881 is about 508.9184834778.
The spelling of 131808881 in words is "one hundred thirty-one million, eight hundred eight thousand, eight hundred eighty-one".