131998635 has 48 divisors (see below), whose sum is σ = 235872000. Its totient is φ = 68258112.

The previous prime is 131998627. The next prime is 131998649. The reversal of 131998635 is 536899131.

131998635 is a `hidden beast` number, since 1 + 3 + 1 + 9 + 9 + 8 + 635 = 666.

It is not a de Polignac number, because 131998635 - 2³ = 131998627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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, 220066 + ... + 220664.

It is an arithmetic number, because the mean of its divisors is an integer number (4914000).

Almost surely, 2^131998635 is an apocalyptic number.

131998635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131998635 is a deficient number, since it is larger than the sum of its proper divisors (103873365).

131998635 is a wasteful number, since it uses less digits than its factorization.

131998635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752 (or 749 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 131998635 is about 11489.0658889224. The cubic root of 131998635 is about 509.1625818859.

The spelling of 131998635 in words is "one hundred thirty-one million, nine hundred ninety-eight thousand, six hundred thirty-five".