31219 has 2 divisors, whose sum is σ = 31220. Its totient is φ = 31218.

The previous prime is 31193. The next prime is 31223. The reversal of 31219 is 91213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31219 - 2⁷ = 31091 is a prime.

It is a super-2 number, since 2×31219² = 1949251922, which contains 22 as substring.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (31249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15609 + 15610.

It is an arithmetic number, because the mean of its divisors is an integer number (15610).

2³¹²¹⁹ is an apocalyptic number.

31219 is a deficient number, since it is larger than the sum of its proper divisors (1).

31219 is an equidigital number, since it uses as much as digits as its factorization.

31219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54, while the sum is 16.

The square root of 31219 is about 176.6889923000. The cubic root of 31219 is about 31.4876074541.

The spelling of 31219 in words is "thirty-one thousand, two hundred nineteen".