209595961 has 4 divisors (see below), whose sum is σ = 210278992. Its totient is φ = 208912932.

The previous prime is 209595959. The next prime is 209595989. The reversal of 209595961 is 169595902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 209595961 - 2¹ = 209595959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209595161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341055 + ... + 341668.

It is an arithmetic number, because the mean of its divisors is an integer number (52569748).

Almost surely, 2^209595961 is an apocalyptic number.

It is an amenable number.

209595961 is a deficient number, since it is larger than the sum of its proper divisors (683031).

209595961 is an equidigital number, since it uses as much as digits as its factorization.

209595961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683030.

The product of its (nonzero) digits is 218700, while the sum is 46.

The square root of 209595961 is about 14477.4293643589. The cubic root of 209595961 is about 594.0107479529.

The spelling of 209595961 in words is "two hundred nine million, five hundred ninety-five thousand, nine hundred sixty-one".