31681418613 has 8 divisors (see below), whose sum is σ = 45491267808. Its totient is φ = 19496257584.

The previous prime is 31681418597. The next prime is 31681418641.

31681418613 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31681418613 - 2⁴ = 31681418597 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31681418693) 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 7 ways as a sum of consecutive naturals, for example, 406171995 + ... + 406172072.

It is an arithmetic number, because the mean of its divisors is an integer number (5686408476).

Almost surely, 2^31681418613 is an apocalyptic number.

It is an amenable number.

31681418613 is a deficient number, since it is larger than the sum of its proper divisors (13809849195).

31681418613 is a wasteful number, since it uses less digits than its factorization.

31681418613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812344083.

The product of its digits is 82944, while the sum is 42.

The spelling of 31681418613 in words is "thirty-one billion, six hundred eighty-one million, four hundred eighteen thousand, six hundred thirteen".