131223642 has 16 divisors (see below), whose sum is σ = 286306272. Its totient is φ = 39764720.

The previous prime is 131223613. The next prime is 131223737. The reversal of 131223642 is 246322131.

It is an unprimeable number.

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, 994053 + ... + 994184.

It is an arithmetic number, because the mean of its divisors is an integer number (17894142).

Almost surely, 2^131223642 is an apocalyptic number.

131223642 is an abundant number, since it is smaller than the sum of its proper divisors (155082630).

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

131223642 is a wasteful number, since it uses less digits than its factorization.

131223642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988253.

The product of its digits is 1728, while the sum is 24.

The square root of 131223642 is about 11455.2888221991. The cubic root of 131223642 is about 508.1641568598.

Adding to 131223642 its reverse (246322131), we get a palindrome (377545773).

The spelling of 131223642 in words is "one hundred thirty-one million, two hundred twenty-three thousand, six hundred forty-two".