131807999 has 4 divisors (see below), whose sum is σ = 132491136. Its totient is φ = 131124864.

The previous prime is 131807993. The next prime is 131808013. The reversal of 131807999 is 999708131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999708131 = 1873 ⋅533747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131807999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131807993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341279 + ... + 341664.

It is an arithmetic number, because the mean of its divisors is an integer number (33122784).

Almost surely, 2^131807999 is an apocalyptic number.

131807999 is a deficient number, since it is larger than the sum of its proper divisors (683137).

131807999 is an equidigital number, since it uses as much as digits as its factorization.

131807999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683136.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 131807999 is about 11480.7664813809. The cubic root of 131807999 is about 508.9173483314.

The spelling of 131807999 in words is "one hundred thirty-one million, eight hundred seven thousand, nine hundred ninety-nine".