131421172 has 12 divisors (see below), whose sum is σ = 239986656. Its totient is φ = 62853560.

The previous prime is 131421109. The next prime is 131421197. The reversal of 131421172 is 271124131.

It is a happy number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 714154 + ... + 714337.

It is an arithmetic number, because the mean of its divisors is an integer number (19998888).

Almost surely, 2^131421172 is an apocalyptic number.

It is an amenable number.

131421172 is a deficient number, since it is larger than the sum of its proper divisors (108565484).

131421172 is a wasteful number, since it uses less digits than its factorization.

131421172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428518 (or 1428516 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 131421172 is about 11463.9073618030. The cubic root of 131421172 is about 508.4190076386.

The spelling of 131421172 in words is "one hundred thirty-one million, four hundred twenty-one thousand, one hundred seventy-two".