31699 has 2 divisors, whose sum is σ = 31700. Its totient is φ = 31698.

The previous prime is 31687. The next prime is 31721. The reversal of 31699 is 99613.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31699 - 2⁵ = 31667 is a prime.

It is a Chen prime.

31699 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (31649) 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, 15849 + 15850.

It is an arithmetic number, because the mean of its divisors is an integer number (15850).

2³¹⁶⁹⁹ is an apocalyptic number.

31699 is a deficient number, since it is larger than the sum of its proper divisors (1).

31699 is an equidigital number, since it uses as much as digits as its factorization.

31699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 28.

The square root of 31699 is about 178.0421298457. The cubic root of 31699 is about 31.6481640141.

The spelling of 31699 in words is "thirty-one thousand, six hundred ninety-nine".