19561085 has 4 divisors (see below), whose sum is σ = 23473308. Its totient is φ = 15648864.

The previous prime is 19561079. The next prime is 19561121. The reversal of 19561085 is 58016591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58016591 = 4373 ⋅13267.

It can be written as a sum of positive squares in 2 ways, for example, as 2105401 + 17455684 = 1451^2 + 4178^2 .

It is a cyclic number.

It is not a de Polignac number, because 19561085 - 2⁶ = 19561021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1956104 + ... + 1956113.

It is an arithmetic number, because the mean of its divisors is an integer number (5868327).

Almost surely, 2^19561085 is an apocalyptic number.

It is an amenable number.

19561085 is a deficient number, since it is larger than the sum of its proper divisors (3912223).

19561085 is an equidigital number, since it uses as much as digits as its factorization.

19561085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912222.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 19561085 is about 4422.7915392883. The cubic root of 19561085 is about 269.4413919502.

The spelling of 19561085 in words is "nineteen million, five hundred sixty-one thousand, eighty-five".