202319989 has 2 divisors, whose sum is σ = 202319990. Its totient is φ = 202319988.

The previous prime is 202319977. The next prime is 202320073. The reversal of 202319989 is 989913202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183467025 + 18852964 = 13545^2 + 4342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202319989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202319939) 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, 101159994 + 101159995.

It is an arithmetic number, because the mean of its divisors is an integer number (101159995).

Almost surely, 2^202319989 is an apocalyptic number.

It is an amenable number.

202319989 is a deficient number, since it is larger than the sum of its proper divisors (1).

202319989 is an equidigital number, since it uses as much as digits as its factorization.

202319989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 202319989 is about 14223.9231226831. The cubic root of 202319989 is about 587.0560898394.

The spelling of 202319989 in words is "two hundred two million, three hundred nineteen thousand, nine hundred eighty-nine".