31117289 has 8 divisors (see below), whose sum is σ = 35596608. Its totient is φ = 26646480.

The previous prime is 31117283. The next prime is 31117297. The reversal of 31117289 is 98271113.

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

It is a de Polignac number, because none of the positive numbers 2^k-31117289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31117283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11879 + ... + 14259.

It is an arithmetic number, because the mean of its divisors is an integer number (4449576).

Almost surely, 2^31117289 is an apocalyptic number.

It is an amenable number.

31117289 is a deficient number, since it is larger than the sum of its proper divisors (4479319).

31117289 is a wasteful number, since it uses less digits than its factorization.

31117289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255.

The product of its digits is 3024, while the sum is 32.

The square root of 31117289 is about 5578.2872819531. The cubic root of 31117289 is about 314.5337487784.

The spelling of 31117289 in words is "thirty-one million, one hundred seventeen thousand, two hundred eighty-nine".