209320641 has 6 divisors (see below), whose sum is σ = 302352050. Its totient is φ = 139547088.

The previous prime is 209320627. The next prime is 209320669. The reversal of 209320641 is 146023902.

It can be written as a sum of positive squares in only one way, i.e., 184280625 + 25040016 = 13575^2 + 5004^2 .

It is not a de Polignac number, because 209320641 - 2²³ = 200932033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209320681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11628916 + ... + 11628933.

Almost surely, 2^209320641 is an apocalyptic number.

It is an amenable number.

209320641 is a deficient number, since it is larger than the sum of its proper divisors (93031409).

209320641 is a wasteful number, since it uses less digits than its factorization.

209320641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23257855 (or 23257852 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 209320641 is about 14467.9176456047. The cubic root of 209320641 is about 593.7505414436.

The spelling of 209320641 in words is "two hundred nine million, three hundred twenty thousand, six hundred forty-one".