201923989 has 2 divisors, whose sum is σ = 201923990. Its totient is φ = 201923988.

The previous prime is 201923959. The next prime is 201924007. The reversal of 201923989 is 989329102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199798225 + 2125764 = 14135^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 201923989 - 2¹³ = 201915797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201923959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100961994 + 100961995.

It is an arithmetic number, because the mean of its divisors is an integer number (100961995).

Almost surely, 2^201923989 is an apocalyptic number.

It is an amenable number.

201923989 is a deficient number, since it is larger than the sum of its proper divisors (1).

201923989 is an equidigital number, since it uses as much as digits as its factorization.

201923989 is an evil number, because the sum of its binary digits is even.

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

The square root of 201923989 is about 14209.9960942993. The cubic root of 201923989 is about 586.6728255997.

The spelling of 201923989 in words is "two hundred one million, nine hundred twenty-three thousand, nine hundred eighty-nine".