131664242 has 4 divisors (see below), whose sum is σ = 197496366. Its totient is φ = 65832120.

The previous prime is 131664233. The next prime is 131664257. The reversal of 131664242 is 242466131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242466131 = 167 ⋅1451893.

It can be written as a sum of positive squares in only one way, i.e., 128845201 + 2819041 = 11351^2 + 1679^2 .

It is a super-4 number, since 4×131664242⁴ (a number of 34 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32916059 + ... + 32916062.

Almost surely, 2^131664242 is an apocalyptic number.

131664242 is a deficient number, since it is larger than the sum of its proper divisors (65832124).

131664242 is an equidigital number, since it uses as much as digits as its factorization.

131664242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65832123.

The product of its digits is 6912, while the sum is 29.

The square root of 131664242 is about 11474.5039979949. The cubic root of 131664242 is about 508.7322633454.

The spelling of 131664242 in words is "one hundred thirty-one million, six hundred sixty-four thousand, two hundred forty-two".