131109990 has 32 divisors (see below), whose sum is σ = 343270656. Its totient is φ = 31784160.

The previous prime is 131109983. The next prime is 131109991. The reversal of 131109990 is 99901131.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131109991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198322 + ... + 198981.

It is an arithmetic number, because the mean of its divisors is an integer number (10727208).

Almost surely, 2^131109990 is an apocalyptic number.

131109990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131109990 is an abundant number, since it is smaller than the sum of its proper divisors (212160666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131109990 is a wasteful number, since it uses less digits than its factorization.

131109990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397324.

The product of its (nonzero) digits is 2187, while the sum is 33.

The square root of 131109990 is about 11450.3270695644. The cubic root of 131109990 is about 508.0174085216.

The spelling of 131109990 in words is "one hundred thirty-one million, one hundred nine thousand, nine hundred ninety".