31679047 has 4 divisors (see below), whose sum is σ = 32216040. Its totient is φ = 31142056.

The previous prime is 31679029. The next prime is 31679057. The reversal of 31679047 is 74097613.

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 31679047 - 2²³ = 23290439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31678997 and 31679015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31679057) 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, 268408 + ... + 268525.

It is an arithmetic number, because the mean of its divisors is an integer number (8054010).

Almost surely, 2^31679047 is an apocalyptic number.

31679047 is a deficient number, since it is larger than the sum of its proper divisors (536993).

31679047 is an equidigital number, since it uses as much as digits as its factorization.

31679047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536992.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 31679047 is about 5628.4142527003. The cubic root of 31679047 is about 316.4152228666.

The spelling of 31679047 in words is "thirty-one million, six hundred seventy-nine thousand, forty-seven".