131221192 has 32 divisors (see below), whose sum is σ = 251812800. Its totient is φ = 64085824.

The previous prime is 131221183. The next prime is 131221193. The reversal of 131221192 is 291122131.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (131221193) 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 7 ways as a sum of consecutive naturals, for example, 80853 + ... + 82459.

It is an arithmetic number, because the mean of its divisors is an integer number (7869150).

Almost surely, 2^131221192 is an apocalyptic number.

It is an amenable number.

131221192 is a deficient number, since it is larger than the sum of its proper divisors (120591608).

131221192 is a wasteful number, since it uses less digits than its factorization.

131221192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845 (or 1841 counting only the distinct ones).

The product of its digits is 216, while the sum is 22.

The square root of 131221192 is about 11455.1818841955. The cubic root of 131221192 is about 508.1609942947.

The spelling of 131221192 in words is "one hundred thirty-one million, two hundred twenty-one thousand, one hundred ninety-two".