31345889 has 4 divisors (see below), whose sum is σ = 31698180. Its totient is φ = 30993600.

The previous prime is 31345871. The next prime is 31345891. The reversal of 31345889 is 98854313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98854313 = 5099 ⋅19387.

It can be written as a sum of positive squares in 2 ways, for example, as 4389025 + 26956864 = 2095^2 + 5192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31345889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31345829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176012 + ... + 176189.

It is an arithmetic number, because the mean of its divisors is an integer number (7924545).

Almost surely, 2^31345889 is an apocalyptic number.

It is an amenable number.

31345889 is a deficient number, since it is larger than the sum of its proper divisors (352291).

31345889 is an equidigital number, since it uses as much as digits as its factorization.

31345889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352290.

The product of its digits is 103680, while the sum is 41.

The square root of 31345889 is about 5598.7399475239. The cubic root of 31345889 is about 315.3021003690.

The spelling of 31345889 in words is "thirty-one million, three hundred forty-five thousand, eight hundred eighty-nine".