19561063 has 4 divisors (see below), whose sum is σ = 20411568. Its totient is φ = 18710560.

The previous prime is 19561027. The next prime is 19561079. The reversal of 19561063 is 36016591.

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

It is a cyclic number.

It is not a de Polignac number, because 19561063 - 2²¹ = 17463911 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19561363) 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, 425218 + ... + 425263.

It is an arithmetic number, because the mean of its divisors is an integer number (5102892).

Almost surely, 2^19561063 is an apocalyptic number.

19561063 is a deficient number, since it is larger than the sum of its proper divisors (850505).

19561063 is an equidigital number, since it uses as much as digits as its factorization.

19561063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850504.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 19561063 is about 4422.7890521706. The cubic root of 19561063 is about 269.4412909382.

The spelling of 19561063 in words is "nineteen million, five hundred sixty-one thousand, sixty-three".