31989171 has 8 divisors (see below), whose sum is σ = 42874000. Its totient is φ = 21215232.

The previous prime is 31989169. The next prime is 31989173. The reversal of 31989171 is 17198913.

It is an interprime number because it is at equal distance from previous prime (31989169) and next prime (31989173).

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

It is not a de Polignac number, because 31989171 - 2¹ = 31989169 is a prime.

It is a super-2 number, since 2×31989171² = 2046614122534482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31989173) 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, 27046 + ... + 28203.

It is an arithmetic number, because the mean of its divisors is an integer number (5359250).

Almost surely, 2^31989171 is an apocalyptic number.

31989171 is a deficient number, since it is larger than the sum of its proper divisors (10884829).

31989171 is a wasteful number, since it uses less digits than its factorization.

31989171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55445.

The product of its digits is 13608, while the sum is 39.

The square root of 31989171 is about 5655.8970110850. The cubic root of 31989171 is about 317.4443939240. Note that the first 3 decimals are identical.

The spelling of 31989171 in words is "thirty-one million, nine hundred eighty-nine thousand, one hundred seventy-one".