31275589 has 2 divisors, whose sum is σ = 31275590. Its totient is φ = 31275588.

The previous prime is 31275583. The next prime is 31275599. The reversal of 31275589 is 98557213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27646564 + 3629025 = 5258^2 + 1905^2 .

It is an emirp because it is prime and its reverse (98557213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31275589 - 2⁵ = 31275557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31275583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15637794 + 15637795.

It is an arithmetic number, because the mean of its divisors is an integer number (15637795).

Almost surely, 2^31275589 is an apocalyptic number.

It is an amenable number.

31275589 is a deficient number, since it is larger than the sum of its proper divisors (1).

31275589 is an equidigital number, since it uses as much as digits as its factorization.

31275589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 31275589 is about 5592.4582251457. The cubic root of 31275589 is about 315.0662126706.

The spelling of 31275589 in words is "thirty-one million, two hundred seventy-five thousand, five hundred eighty-nine".