131866961 has 2 divisors, whose sum is σ = 131866962. Its totient is φ = 131866960.

The previous prime is 131866949. The next prime is 131866991. The reversal of 131866961 is 169668131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130530625 + 1336336 = 11425^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 131866961 - 2²⁶ = 64758097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131866991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65933480 + 65933481.

It is an arithmetic number, because the mean of its divisors is an integer number (65933481).

Almost surely, 2^131866961 is an apocalyptic number.

It is an amenable number.

131866961 is a deficient number, since it is larger than the sum of its proper divisors (1).

131866961 is an equidigital number, since it uses as much as digits as its factorization.

131866961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 131866961 is about 11483.3340541848. The cubic root of 131866961 is about 508.9932221067.

The spelling of 131866961 in words is "one hundred thirty-one million, eight hundred sixty-six thousand, nine hundred sixty-one".