31008889 has 2 divisors, whose sum is σ = 31008890. Its totient is φ = 31008888.

The previous prime is 31008851. The next prime is 31008941. The reversal of 31008889 is 98880013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25755625 + 5253264 = 5075^2 + 2292^2 .

It is a cyclic number.

It is not a de Polignac number, because 31008889 - 2¹⁷ = 30877817 is a prime.

It is not a weakly prime, because it can be changed into another prime (31008839) 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 as a sum of consecutive naturals, namely, 15504444 + 15504445.

It is an arithmetic number, because the mean of its divisors is an integer number (15504445).

Almost surely, 2^31008889 is an apocalyptic number.

It is an amenable number.

31008889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31008889 is an equidigital number, since it uses as much as digits as its factorization.

31008889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 31008889 is about 5568.5625613797. The cubic root of 31008889 is about 314.1680878887.

The spelling of 31008889 in words is "thirty-one million, eight thousand, eight hundred eighty-nine".