131991102 has 24 divisors (see below), whose sum is σ = 286813800. Its totient is φ = 43868880.

The previous prime is 131991073. The next prime is 131991103. The reversal of 131991102 is 201199131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131991103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4224 + ... + 16787.

It is an arithmetic number, because the mean of its divisors is an integer number (11950575).

Almost surely, 2^131991102 is an apocalyptic number.

131991102 is an abundant number, since it is smaller than the sum of its proper divisors (154822698).

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

131991102 is a wasteful number, since it uses less digits than its factorization.

131991102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21368 (or 21365 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 131991102 is about 11488.7380508044. The cubic root of 131991102 is about 509.1528959405.

The spelling of 131991102 in words is "one hundred thirty-one million, nine hundred ninety-one thousand, one hundred two".