131666449 has 2 divisors, whose sum is σ = 131666450. Its totient is φ = 131666448.

The previous prime is 131666443. The next prime is 131666477. The reversal of 131666449 is 944666131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130302225 + 1364224 = 11415^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 131666449 - 2⁵ = 131666417 is a prime.

It is not a weakly prime, because it can be changed into another prime (131666443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65833224 + 65833225.

It is an arithmetic number, because the mean of its divisors is an integer number (65833225).

Almost surely, 2^131666449 is an apocalyptic number.

It is an amenable number.

131666449 is a deficient number, since it is larger than the sum of its proper divisors (1).

131666449 is an equidigital number, since it uses as much as digits as its factorization.

131666449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 131666449 is about 11474.6001673261. The cubic root of 131666449 is about 508.7351058429.

The spelling of 131666449 in words is "one hundred thirty-one million, six hundred sixty-six thousand, four hundred forty-nine".