31989065 has 8 divisors (see below), whose sum is σ = 40407360. Its totient is φ = 24244272.

The previous prime is 31989049. The next prime is 31989079. The reversal of 31989065 is 56098913.

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 31989065 - 2⁴ = 31989049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168269 + ... + 168458.

It is an arithmetic number, because the mean of its divisors is an integer number (5050920).

Almost surely, 2^31989065 is an apocalyptic number.

It is an amenable number.

31989065 is a deficient number, since it is larger than the sum of its proper divisors (8418295).

31989065 is a wasteful number, since it uses less digits than its factorization.

31989065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336751.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 31989065 is about 5655.8876403267. The cubic root of 31989065 is about 317.4440432935. Note that the first 3 decimals are identical.

The spelling of 31989065 in words is "thirty-one million, nine hundred eighty-nine thousand, sixty-five".