31989097 has 8 divisors (see below), whose sum is σ = 36628416. Its totient is φ = 27367152.

The previous prime is 31989091. The next prime is 31989101. The reversal of 31989097 is 79098913.

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 31989097 - 2¹¹ = 31987049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31989091) 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 in 7 ways as a sum of consecutive naturals, for example, 118 + ... + 7999.

It is an arithmetic number, because the mean of its divisors is an integer number (4578552).

Almost surely, 2^31989097 is an apocalyptic number.

It is an amenable number.

31989097 is a deficient number, since it is larger than the sum of its proper divisors (4639319).

31989097 is an equidigital number, since it uses as much as digits as its factorization.

31989097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8687.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 31989097 is about 5655.8904692365. The cubic root of 31989097 is about 317.4441491443. Note that the first 3 decimals are identical.

The spelling of 31989097 in words is "thirty-one million, nine hundred eighty-nine thousand, ninety-seven".