131220242 has 16 divisors (see below), whose sum is σ = 199587192. Its totient is φ = 64696320.

The previous prime is 131220223. The next prime is 131220253. The reversal of 131220242 is 242022131.

It can be written as a sum of positive squares in 4 ways, for example, as 75881521 + 55338721 = 8711^2 + 7439^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131220242.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59642 + ... + 61802.

Almost surely, 2^131220242 is an apocalyptic number.

131220242 is a deficient number, since it is larger than the sum of its proper divisors (68366950).

131220242 is a wasteful number, since it uses less digits than its factorization.

131220242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 131220242 is about 11455.1404181704. The cubic root of 131220242 is about 508.1597679834.

Adding to 131220242 its reverse (242022131), we get a palindrome (373242373).

The spelling of 131220242 in words is "one hundred thirty-one million, two hundred twenty thousand, two hundred forty-two".