31681679 has 4 divisors (see below), whose sum is σ = 31733976. Its totient is φ = 31629384.

The previous prime is 31681673. The next prime is 31681703. The reversal of 31681679 is 97618613.

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-31681679 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 (31681673) 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, 25229 + ... + 26454.

It is an arithmetic number, because the mean of its divisors is an integer number (7933494).

Almost surely, 2^31681679 is an apocalyptic number.

31681679 is a deficient number, since it is larger than the sum of its proper divisors (52297).

31681679 is an equidigital number, since it uses as much as digits as its factorization.

31681679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52296.

The product of its digits is 54432, while the sum is 41.

The square root of 31681679 is about 5628.6480614798. The cubic root of 31681679 is about 316.4239855650.

The spelling of 31681679 in words is "thirty-one million, six hundred eighty-one thousand, six hundred seventy-nine".