31680051479 has 4 divisors (see below), whose sum is σ = 31690534176. Its totient is φ = 31669568784.

The previous prime is 31680051467. The next prime is 31680051499. The reversal of 31680051479 is 97415008613.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31680051479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31680051449) 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, 5236814 + ... + 5242859.

It is an arithmetic number, because the mean of its divisors is an integer number (7922633544).

Almost surely, 2^31680051479 is an apocalyptic number.

31680051479 is a deficient number, since it is larger than the sum of its proper divisors (10482697).

31680051479 is a wasteful number, since it uses less digits than its factorization.

31680051479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10482696.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 31680051479 in words is "thirty-one billion, six hundred eighty million, fifty-one thousand, four hundred seventy-nine".