31047879 has 4 divisors (see below), whose sum is σ = 41397176. Its totient is φ = 20698584.

The previous prime is 31047859. The next prime is 31047923. The reversal of 31047879 is 97874013.

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

It is not a de Polignac number, because 31047879 - 2¹⁵ = 31015111 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 (31047839) 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, 5174644 + ... + 5174649.

It is an arithmetic number, because the mean of its divisors is an integer number (10349294).

Almost surely, 2^31047879 is an apocalyptic number.

31047879 is a deficient number, since it is larger than the sum of its proper divisors (10349297).

31047879 is a wasteful number, since it uses less digits than its factorization.

31047879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10349296.

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

The square root of 31047879 is about 5572.0623650494. The cubic root of 31047879 is about 314.2997091072.

The spelling of 31047879 in words is "thirty-one million, forty-seven thousand, eight hundred seventy-nine".