131299999 has 16 divisors (see below), whose sum is σ = 139741056. Its totient is φ = 123206400.

The previous prime is 131299997. The next prime is 131300047. The reversal of 131299999 is 999992131.

It is a cyclic number.

It is not a de Polignac number, because 131299999 - 2¹ = 131299997 is a prime.

It is a Duffinian number.

131299999 is a modest number, since divided by 99999 gives 1312 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131299997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116989 + ... + 118105.

It is an arithmetic number, because the mean of its divisors is an integer number (8733816).

Almost surely, 2^131299999 is an apocalyptic number.

131299999 is a deficient number, since it is larger than the sum of its proper divisors (8441057).

131299999 is a wasteful number, since it uses less digits than its factorization.

131299999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266.

The product of its digits is 354294, while the sum is 52.

The square root of 131299999 is about 11458.6211648697. The cubic root of 131299999 is about 508.2627020262.

The spelling of 131299999 in words is "one hundred thirty-one million, two hundred ninety-nine thousand, nine hundred ninety-nine".