31203089 has 2 divisors, whose sum is σ = 31203090. Its totient is φ = 31203088.

The previous prime is 31203059. The next prime is 31203113. The reversal of 31203089 is 98030213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30991489 + 211600 = 5567^2 + 460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31203089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31203049) 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, 15601544 + 15601545.

It is an arithmetic number, because the mean of its divisors is an integer number (15601545).

Almost surely, 2^31203089 is an apocalyptic number.

It is an amenable number.

31203089 is a deficient number, since it is larger than the sum of its proper divisors (1).

31203089 is an equidigital number, since it uses as much as digits as its factorization.

31203089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 31203089 is about 5585.9725205196. The cubic root of 31203089 is about 314.8225724582.

The spelling of 31203089 in words is "thirty-one million, two hundred three thousand, eighty-nine".