31989199 has 8 divisors (see below), whose sum is σ = 35130240. Its totient is φ = 28887000.

The previous prime is 31989173. The next prime is 31989203. The reversal of 31989199 is 99198913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31989199 - 2⁹ = 31988687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31989169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7969 + ... + 11290.

It is an arithmetic number, because the mean of its divisors is an integer number (4391280).

Almost surely, 2^31989199 is an apocalyptic number.

31989199 is a deficient number, since it is larger than the sum of its proper divisors (3141041).

31989199 is a wasteful number, since it uses less digits than its factorization.

31989199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19421.

The product of its digits is 157464, while the sum is 49.

The square root of 31989199 is about 5655.8994863770. The cubic root of 31989199 is about 317.4444865433. Note that the first 4 decimals are identical.

The spelling of 31989199 in words is "thirty-one million, nine hundred eighty-nine thousand, one hundred ninety-nine".