31989983 has 2 divisors, whose sum is σ = 31989984. Its totient is φ = 31989982.

The previous prime is 31989959. The next prime is 31990003. The reversal of 31989983 is 38998913.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31989983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31989383) 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 as a sum of consecutive naturals, namely, 15994991 + 15994992.

It is an arithmetic number, because the mean of its divisors is an integer number (15994992).

Almost surely, 2^31989983 is an apocalyptic number.

31989983 is a deficient number, since it is larger than the sum of its proper divisors (1).

31989983 is an equidigital number, since it uses as much as digits as its factorization.

31989983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 50.

The square root of 31989983 is about 5655.9687941148. The cubic root of 31989983 is about 317.4470798607.

The spelling of 31989983 in words is "thirty-one million, nine hundred eighty-nine thousand, nine hundred eighty-three".