209061641 has 4 divisors (see below), whose sum is σ = 212182032. Its totient is φ = 205941252.

The previous prime is 209061637. The next prime is 209061647. The reversal of 209061641 is 146160902.

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 209061641 - 2² = 209061637 is a prime.

It is a super-2 number, since 2×209061641² = 87413539475225762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209061647) 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, 1560095 + ... + 1560228.

It is an arithmetic number, because the mean of its divisors is an integer number (53045508).

Almost surely, 2^209061641 is an apocalyptic number.

It is an amenable number.

209061641 is a deficient number, since it is larger than the sum of its proper divisors (3120391).

209061641 is an equidigital number, since it uses as much as digits as its factorization.

209061641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120390.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 209061641 is about 14458.9640361957. The cubic root of 209061641 is about 593.5055506971.

The spelling of 209061641 in words is "two hundred nine million, sixty-one thousand, six hundred forty-one".