131867999 has 4 divisors (see below), whose sum is σ = 138808440. Its totient is φ = 124927560.

The previous prime is 131867969. The next prime is 131868001. The reversal of 131867999 is 999768131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999768131 = 151 ⋅6620981.

It is a cyclic number.

It is not a de Polignac number, because 131867999 - 2²⁴ = 115090783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131867999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131867969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3470192 + ... + 3470229.

It is an arithmetic number, because the mean of its divisors is an integer number (34702110).

Almost surely, 2^131867999 is an apocalyptic number.

131867999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

131867999 is a deficient number, since it is larger than the sum of its proper divisors (6940441).

131867999 is an equidigital number, since it uses as much as digits as its factorization.

131867999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940440.

The product of its digits is 734832, while the sum is 53.

The square root of 131867999 is about 11483.3792500291. The cubic root of 131867999 is about 508.9945576284.

The spelling of 131867999 in words is "one hundred thirty-one million, eight hundred sixty-seven thousand, nine hundred ninety-nine".