31679539 has 4 divisors (see below), whose sum is σ = 31874056. Its totient is φ = 31485024.

The previous prime is 31679509. The next prime is 31679563. The reversal of 31679539 is 93597613.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31679539 - 2⁵ = 31679507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31679495 and 31679504.

It is not an unprimeable number, because it can be changed into a prime (31679509) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 97014 + ... + 97339.

It is an arithmetic number, because the mean of its divisors is an integer number (7968514).

Almost surely, 2^31679539 is an apocalyptic number.

31679539 is a deficient number, since it is larger than the sum of its proper divisors (194517).

31679539 is a wasteful number, since it uses less digits than its factorization.

31679539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194516.

The product of its digits is 153090, while the sum is 43.

The square root of 31679539 is about 5628.4579593349. The cubic root of 31679539 is about 316.4168609155.

The spelling of 31679539 in words is "thirty-one million, six hundred seventy-nine thousand, five hundred thirty-nine".