31320889 has 2 divisors, whose sum is σ = 31320890. Its totient is φ = 31320888.

The previous prime is 31320853. The next prime is 31320929. The reversal of 31320889 is 98802313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30437289 + 883600 = 5517^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320889 - 2¹⁵ = 31288121 is a prime.

It is not a weakly prime, because it can be changed into another prime (31320829) 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 as a sum of consecutive naturals, namely, 15660444 + 15660445.

It is an arithmetic number, because the mean of its divisors is an integer number (15660445).

Almost surely, 2^31320889 is an apocalyptic number.

It is an amenable number.

31320889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320889 is an equidigital number, since it uses as much as digits as its factorization.

31320889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 31320889 is about 5596.5068569600. The cubic root of 31320889 is about 315.2182547221.

The spelling of 31320889 in words is "thirty-one million, three hundred twenty thousand, eight hundred eighty-nine".