318172042 has 4 divisors (see below), whose sum is σ = 477258066. Its totient is φ = 159086020.

The previous prime is 318172039. The next prime is 318172061. The reversal of 318172042 is 240271813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240271813 = 97 ⋅2477029.

It can be written as a sum of positive squares in only one way, i.e., 292375801 + 25796241 = 17099^2 + 5079^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 318172042.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79543009 + ... + 79543012.

Almost surely, 2^318172042 is an apocalyptic number.

318172042 is a deficient number, since it is larger than the sum of its proper divisors (159086024).

318172042 is a wasteful number, since it uses less digits than its factorization.

318172042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159086023.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 318172042 is about 17837.3776660136. The cubic root of 318172042 is about 682.6854890826.

The spelling of 318172042 in words is "three hundred eighteen million, one hundred seventy-two thousand, forty-two".