131905206 has 32 divisors (see below), whose sum is σ = 293529600. Its totient is φ = 43907400.

The previous prime is 131905183. The next prime is 131905229. The reversal of 131905206 is 602509131.

131905206 is a `hidden beast` number, since 131 + 9 + 0 + 520 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (131905183) and next prime (131905229).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 131905206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54931 + ... + 57281.

It is an arithmetic number, because the mean of its divisors is an integer number (9172800).

Almost surely, 2^131905206 is an apocalyptic number.

131905206 is an abundant number, since it is smaller than the sum of its proper divisors (161624394).

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

131905206 is a wasteful number, since it uses less digits than its factorization.

131905206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401 (or 3395 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 131905206 is about 11484.9991728341. Note that the first 3 decimals coincide. The cubic root of 131905206 is about 509.0424246363.

The spelling of 131905206 in words is "one hundred thirty-one million, nine hundred five thousand, two hundred six".