209094989 has 2 divisors, whose sum is σ = 209094990. Its totient is φ = 209094988.

The previous prime is 209094983. The next prime is 209095009. The reversal of 209094989 is 989490902.

209094989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143760100 + 65334889 = 11990^2 + 8083^2 .

It is a cyclic number.

It is not a de Polignac number, because 209094989 - 2⁴ = 209094973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209094983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104547494 + 104547495.

It is an arithmetic number, because the mean of its divisors is an integer number (104547495).

Almost surely, 2^209094989 is an apocalyptic number.

It is an amenable number.

209094989 is a deficient number, since it is larger than the sum of its proper divisors (1).

209094989 is an equidigital number, since it uses as much as digits as its factorization.

209094989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 209094989 is about 14460.1171848640. The cubic root of 209094989 is about 593.5371062561.

It can be divided in two parts, 2090 and 94989, that added together give a palindrome (97079).

The spelling of 209094989 in words is "two hundred nine million, ninety-four thousand, nine hundred eighty-nine".