131978242 has 16 divisors (see below), whose sum is σ = 228668832. Its totient is φ = 56461120.

The previous prime is 131978239. The next prime is 131978243. The reversal of 131978242 is 242879131.

It is a super-2 number, since 2×131978242² = 34836512722821128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131978243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176068 + ... + 176815.

It is an arithmetic number, because the mean of its divisors is an integer number (14291802).

Almost surely, 2^131978242 is an apocalyptic number.

131978242 is a deficient number, since it is larger than the sum of its proper divisors (96690590).

131978242 is a wasteful number, since it uses less digits than its factorization.

131978242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352913.

The product of its digits is 24192, while the sum is 37.

The square root of 131978242 is about 11488.1783586433. The cubic root of 131978242 is about 509.1363596771.

The spelling of 131978242 in words is "one hundred thirty-one million, nine hundred seventy-eight thousand, two hundred forty-two".