31679 has 4 divisors (see below), whose sum is σ = 32160. Its totient is φ = 31200.
The previous prime is 31667. The next prime is 31687. The reversal of 31679 is 97613.
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 31679 - 24 = 31663 is a prime.
It is a Duffinian number.
It is a plaindrome in base 13 and base 16.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (31649) 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, 122 + ... + 279.
It is an arithmetic number, because the mean of its divisors is an integer number (8040).
231679 is an apocalyptic number.
31679 is a deficient number, since it is larger than the sum of its proper divisors (481).
31679 is an equidigital number, since it uses as much as digits as its factorization.
31679 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 480.
The product of its digits is 1134, while the sum is 26.
The square root of 31679 is about 177.9859545020. The cubic root of 31679 is about 31.6415066385.
It can be divided in two parts, 316 and 79, that multiplied together give a square (24964 = 1582).
The spelling of 31679 in words is "thirty-one thousand, six hundred seventy-nine".
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