31879047 has 4 divisors (see below), whose sum is σ = 42505400. Its totient is φ = 21252696.

The previous prime is 31879021. The next prime is 31879049. The reversal of 31879047 is 74097813.

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

It is not a de Polignac number, because 31879047 - 2⁶ = 31878983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31878996 and 31879014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31879049) 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, 5313172 + ... + 5313177.

It is an arithmetic number, because the mean of its divisors is an integer number (10626350).

Almost surely, 2^31879047 is an apocalyptic number.

31879047 is a deficient number, since it is larger than the sum of its proper divisors (10626353).

31879047 is a wasteful number, since it uses less digits than its factorization.

31879047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10626352.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 31879047 is about 5646.1532922867. The cubic root of 31879047 is about 317.0797034439.

The spelling of 31879047 in words is "thirty-one million, eight hundred seventy-nine thousand, forty-seven".