209050819 has 8 divisors (see below), whose sum is σ = 221762448. Its totient is φ = 196385280.

The previous prime is 209050817. The next prime is 209050823. The reversal of 209050819 is 918050902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209050819 - 2¹ = 209050817 is a prime.

It is a super-2 number, since 2×209050819² = 87404489849141522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209050813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1942 + ... + 20539.

It is an arithmetic number, because the mean of its divisors is an integer number (27720306).

Almost surely, 2^209050819 is an apocalyptic number.

209050819 is a deficient number, since it is larger than the sum of its proper divisors (12711629).

209050819 is a wasteful number, since it uses less digits than its factorization.

209050819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23045.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 209050819 is about 14458.5897998387. The cubic root of 209050819 is about 593.4953096539.

The spelling of 209050819 in words is "two hundred nine million, fifty thousand, eight hundred nineteen".