31323230189 has 2 divisors, whose sum is σ = 31323230190. Its totient is φ = 31323230188.

The previous prime is 31323230077. The next prime is 31323230207. The reversal of 31323230189 is 98103232313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16653902500 + 14669327689 = 129050^2 + 121117^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323230189 - 2³² = 27028262893 is a prime.

It is a super-2 number, since 2×31323230189² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31323230989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661615094 + 15661615095.

It is an arithmetic number, because the mean of its divisors is an integer number (15661615095).

Almost surely, 2^31323230189 is an apocalyptic number.

It is an amenable number.

31323230189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323230189 is an equidigital number, since it uses as much as digits as its factorization.

31323230189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 31323230189 in words is "thirty-one billion, three hundred twenty-three million, two hundred thirty thousand, one hundred eighty-nine".