131561199 has 32 divisors (see below), whose sum is σ = 243002880. Its totient is φ = 68342400.

The previous prime is 131561191. The next prime is 131561207. The reversal of 131561199 is 991165131.

It is a happy number.

131561199 is a `hidden beast` number, since 1 + 3 + 1 + 561 + 1 + 99 = 666.

It is an interprime number because it is at equal distance from previous prime (131561191) and next prime (131561207).

It is not a de Polignac number, because 131561199 - 2³ = 131561191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131561191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29562 + ... + 33719.

It is an arithmetic number, because the mean of its divisors is an integer number (7593840).

Almost surely, 2^131561199 is an apocalyptic number.

131561199 is a deficient number, since it is larger than the sum of its proper divisors (111441681).

131561199 is a wasteful number, since it uses less digits than its factorization.

131561199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63308 (or 63302 counting only the distinct ones).

The product of its digits is 7290, while the sum is 36.

The square root of 131561199 is about 11470.0130339943. The cubic root of 131561199 is about 508.5995141163.

The spelling of 131561199 in words is "one hundred thirty-one million, five hundred sixty-one thousand, one hundred ninety-nine".