131283999 has 48 divisors (see below), whose sum is σ = 237519360. Its totient is φ = 67884480.

The previous prime is 131283973. The next prime is 131284033. The reversal of 131283999 is 999382131.

It is a happy number.

It is not a de Polignac number, because 131283999 - 2⁹ = 131283487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131283959) 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 47 ways as a sum of consecutive naturals, for example, 269334 + ... + 269820.

It is an arithmetic number, because the mean of its divisors is an integer number (4948320).

Almost surely, 2^131283999 is an apocalyptic number.

131283999 is a deficient number, since it is larger than the sum of its proper divisors (106235361).

131283999 is a wasteful number, since it uses less digits than its factorization.

131283999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900 (or 897 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 131283999 is about 11457.9229793187. The cubic root of 131283999 is about 508.2420558377.

The spelling of 131283999 in words is "one hundred thirty-one million, two hundred eighty-three thousand, nine hundred ninety-nine".