318531697 has 4 divisors (see below), whose sum is σ = 347489136. Its totient is φ = 289574260.

The previous prime is 318531683. The next prime is 318531701. The reversal of 318531697 is 796135813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 796135813 = 11 ⋅72375983.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318531697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318531667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14478703 + ... + 14478724.

It is an arithmetic number, because the mean of its divisors is an integer number (86872284).

Almost surely, 2^318531697 is an apocalyptic number.

It is an amenable number.

318531697 is a deficient number, since it is larger than the sum of its proper divisors (28957439).

318531697 is a wasteful number, since it uses less digits than its factorization.

318531697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28957438.

The product of its digits is 136080, while the sum is 43.

The square root of 318531697 is about 17847.4563173579. The cubic root of 318531697 is about 682.9426233378.

It can be divided in two parts, 3185 and 31697, that multiplied together give a triangular number (100954945 = T₁₄₂₀₉).

The spelling of 318531697 in words is "three hundred eighteen million, five hundred thirty-one thousand, six hundred ninety-seven".