131999969 has 2 divisors, whose sum is σ = 131999970. Its totient is φ = 131999968.

The previous prime is 131999957. The next prime is 132000007. The reversal of 131999969 is 969999131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122389969 + 9610000 = 11063^2 + 3100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131999969 is a prime.

It is a super-2 number, since 2×131999969² = 34847983632001922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131998969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65999984 + 65999985.

It is an arithmetic number, because the mean of its divisors is an integer number (65999985).

Almost surely, 2^131999969 is an apocalyptic number.

It is an amenable number.

131999969 is a deficient number, since it is larger than the sum of its proper divisors (1).

131999969 is an equidigital number, since it uses as much as digits as its factorization.

131999969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1062882, while the sum is 56.

The square root of 131999969 is about 11489.1239439741. The cubic root of 131999969 is about 509.1642971071.

The spelling of 131999969 in words is "one hundred thirty-one million, nine hundred ninety-nine thousand, nine hundred sixty-nine".