131992221 has 16 divisors (see below), whose sum is σ = 185608640. Its totient is φ = 83203200.

The previous prime is 131992219. The next prime is 131992247. The reversal of 131992221 is 122299131.

It is not a de Polignac number, because 131992221 - 2¹ = 131992219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131992321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32331 + ... + 36183.

It is an arithmetic number, because the mean of its divisors is an integer number (11600540).

Almost surely, 2^131992221 is an apocalyptic number.

It is an amenable number.

131992221 is a deficient number, since it is larger than the sum of its proper divisors (53616419).

131992221 is a wasteful number, since it uses less digits than its factorization.

131992221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4476.

The product of its digits is 1944, while the sum is 30.

The square root of 131992221 is about 11488.7867505668. The cubic root of 131992221 is about 509.1543347761.

The spelling of 131992221 in words is "one hundred thirty-one million, nine hundred ninety-two thousand, two hundred twenty-one".