31140877018 has 4 divisors (see below), whose sum is σ = 46711315530. Its totient is φ = 15570438508.

The previous prime is 31140876973. The next prime is 31140877021. The reversal of 31140877018 is 81077804113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81077804113 = 71 ⋅1141940903.

It can be written as a sum of positive squares in only one way, i.e., 20382416289 + 10758460729 = 142767^2 + 103723^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7785219253 + ... + 7785219256.

Almost surely, 2^31140877018 is an apocalyptic number.

31140877018 is a deficient number, since it is larger than the sum of its proper divisors (15570438512).

31140877018 is a wasteful number, since it uses less digits than its factorization.

31140877018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15570438511.

The product of its (nonzero) digits is 37632, while the sum is 40.

The spelling of 31140877018 in words is "thirty-one billion, one hundred forty million, eight hundred seventy-seven thousand, eighteen".