131918990 has 32 divisors (see below), whose sum is σ = 272208384. Its totient is φ = 45090720.

The previous prime is 131918977. The next prime is 131918993. The reversal of 131918990 is 99819131.

It is a happy number.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131918993) 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 15 ways as a sum of consecutive naturals, for example, 21575 + ... + 27005.

It is an arithmetic number, because the mean of its divisors is an integer number (8506512).

Almost surely, 2^131918990 is an apocalyptic number.

131918990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131918990 is an abundant number, since it is smaller than the sum of its proper divisors (140289394).

131918990 is a wasteful number, since it uses less digits than its factorization.

131918990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5792.

The product of its (nonzero) digits is 17496, while the sum is 41.

The square root of 131918990 is about 11485.5992442711. The cubic root of 131918990 is about 509.0601555421.

The spelling of 131918990 in words is "one hundred thirty-one million, nine hundred eighteen thousand, nine hundred ninety".