318197772131 has 4 divisors (see below), whose sum is σ = 318420445200. Its totient is φ = 317975099064.

The previous prime is 318197772103. The next prime is 318197772133. The reversal of 318197772131 is 131277791813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131277791813 = 7 ⋅18753970259.

It is a cyclic number.

It is not a de Polignac number, because 318197772131 - 2²² = 318193577827 is a prime.

It is a super-2 number, since 2×318197772131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 318197772131.

It is not an unprimeable number, because it can be changed into a prime (318197772133) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 111334391 + ... + 111337248.

It is an arithmetic number, because the mean of its divisors is an integer number (79605111300).

Almost surely, 2^318197772131 is an apocalyptic number.

318197772131 is a deficient number, since it is larger than the sum of its proper divisors (222673069).

318197772131 is a wasteful number, since it uses less digits than its factorization.

318197772131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222673068.

The product of its digits is 444528, while the sum is 50.

The spelling of 318197772131 in words is "three hundred eighteen billion, one hundred ninety-seven million, seven hundred seventy-two thousand, one hundred thirty-one".