31319 has 2 divisors, whose sum is σ = 31320. Its totient is φ = 31318.

The previous prime is 31307. The next prime is 31321. The reversal of 31319 is 91313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31319 - 2⁸ = 31063 is a prime.

It is a super-2 number, since 2×31319² = 1961759522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 31321, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31297 and 31306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15659 + 15660.

It is an arithmetic number, because the mean of its divisors is an integer number (15660).

2³¹³¹⁹ is an apocalyptic number.

31319 is a deficient number, since it is larger than the sum of its proper divisors (1).

31319 is an equidigital number, since it uses as much as digits as its factorization.

31319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81, while the sum is 17.

The square root of 31319 is about 176.9717491579. The cubic root of 31319 is about 31.5211917532.

It can be divided in two parts, 31 and 319, that multiplied together give a palindrome (9889).

The spelling of 31319 in words is "thirty-one thousand, three hundred nineteen".