19561055 has 4 divisors (see below), whose sum is σ = 23473272. Its totient is φ = 15648840.

The previous prime is 19561027. The next prime is 19561079. The reversal of 19561055 is 55016591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55016591 = 7 ⋅7859513.

It is not a de Polignac number, because 19561055 - 2⁸ = 19560799 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, 1956101 + ... + 1956110.

It is an arithmetic number, because the mean of its divisors is an integer number (5868318).

Almost surely, 2^19561055 is an apocalyptic number.

19561055 is a deficient number, since it is larger than the sum of its proper divisors (3912217).

19561055 is an equidigital number, since it uses as much as digits as its factorization.

19561055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912216.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 19561055 is about 4422.7881477638. The cubic root of 19561055 is about 269.4412542066.

The spelling of 19561055 in words is "nineteen million, five hundred sixty-one thousand, fifty-five".