31217089 has 2 divisors, whose sum is σ = 31217090. Its totient is φ = 31217088.

The previous prime is 31217059. The next prime is 31217111. The reversal of 31217089 is 98071213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27217089 + 4000000 = 5217^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 31217089 - 2⁷ = 31216961 is a prime.

It is a Chen prime.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 31217089.

It is not a weakly prime, because it can be changed into another prime (31217009) 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, 15608544 + 15608545.

It is an arithmetic number, because the mean of its divisors is an integer number (15608545).

Almost surely, 2^31217089 is an apocalyptic number.

It is an amenable number.

31217089 is a deficient number, since it is larger than the sum of its proper divisors (1).

31217089 is an equidigital number, since it uses as much as digits as its factorization.

31217089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 31217089 is about 5587.2255189853. The cubic root of 31217089 is about 314.8696496028.

The spelling of 31217089 in words is "thirty-one million, two hundred seventeen thousand, eighty-nine".