209107019 has 4 divisors (see below), whose sum is σ = 228116760. Its totient is φ = 190097280.

The previous prime is 209107009. The next prime is 209107037. The reversal of 209107019 is 910701902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209107019 is a prime.

It is a super-2 number, since 2×209107019² = 87451490790132722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209106982 and 209107000.

It is not an unprimeable number, because it can be changed into a prime (209107009) 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, 9504854 + ... + 9504875.

It is an arithmetic number, because the mean of its divisors is an integer number (57029190).

Almost surely, 2^209107019 is an apocalyptic number.

209107019 is a deficient number, since it is larger than the sum of its proper divisors (19009741).

209107019 is a wasteful number, since it uses less digits than its factorization.

209107019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19009740.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 209107019 is about 14460.5331506138. The cubic root of 209107019 is about 593.5484888252.

The spelling of 209107019 in words is "two hundred nine million, one hundred seven thousand, nineteen".