31679789 has 4 divisors (see below), whose sum is σ = 33543324. Its totient is φ = 29816256.

The previous prime is 31679779. The next prime is 31679797. The reversal of 31679789 is 98797613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98797613 = 61 ⋅1619633.

It can be written as a sum of positive squares in 2 ways, for example, as 13446889 + 18232900 = 3667^2 + 4270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31679789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31679729) 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, 931742 + ... + 931775.

It is an arithmetic number, because the mean of its divisors is an integer number (8385831).

Almost surely, 2^31679789 is an apocalyptic number.

It is an amenable number.

31679789 is a deficient number, since it is larger than the sum of its proper divisors (1863535).

31679789 is a wasteful number, since it uses less digits than its factorization.

31679789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863534.

The product of its digits is 571536, while the sum is 50.

The square root of 31679789 is about 5628.4801678606. The cubic root of 31679789 is about 316.4176932509.

The spelling of 31679789 in words is "thirty-one million, six hundred seventy-nine thousand, seven hundred eighty-nine".