131319999 has 24 divisors (see below), whose sum is σ = 196420224. Its totient is φ = 84456000.

The previous prime is 131319997. The next prime is 131320009. The reversal of 131319999 is 999913131.

It is not a de Polignac number, because 131319999 - 2¹ = 131319997 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131319997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128109 + ... + 129129.

It is an arithmetic number, because the mean of its divisors is an integer number (8184176).

Almost surely, 2^131319999 is an apocalyptic number.

131319999 is a deficient number, since it is larger than the sum of its proper divisors (65100225).

131319999 is a wasteful number, since it uses less digits than its factorization.

131319999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519 (or 1516 counting only the distinct ones).

The product of its digits is 59049, while the sum is 45.

The square root of 131319999 is about 11459.4938369895. The cubic root of 131319999 is about 508.2885074032.

It can be divided in two parts, 1313 and 19999, that added together give a palindrome (21312).

The spelling of 131319999 in words is "one hundred thirty-one million, three hundred nineteen thousand, nine hundred ninety-nine".