31089589 has 2 divisors, whose sum is σ = 31089590. Its totient is φ = 31089588.

The previous prime is 31089563. The next prime is 31089601. The reversal of 31089589 is 98598013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23571025 + 7518564 = 4855^2 + 2742^2 .

It is a cyclic number.

It is not a de Polignac number, because 31089589 - 2¹¹ = 31087541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31089689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15544794 + 15544795.

It is an arithmetic number, because the mean of its divisors is an integer number (15544795).

Almost surely, 2^31089589 is an apocalyptic number.

It is an amenable number.

31089589 is a deficient number, since it is larger than the sum of its proper divisors (1).

31089589 is an equidigital number, since it uses as much as digits as its factorization.

31089589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 31089589 is about 5575.8038882299. The cubic root of 31089589 is about 314.4403904809.

The spelling of 31089589 in words is "thirty-one million, eighty-nine thousand, five hundred eighty-nine".