19561223 has 12 divisors (see below), whose sum is σ = 22031184. Its totient is φ = 17344800.

The previous prime is 19561207. The next prime is 19561231. The reversal of 19561223 is 32216591.

It is not a de Polignac number, because 19561223 - 2⁴ = 19561207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19561723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2990 + ... + 6932.

It is an arithmetic number, because the mean of its divisors is an integer number (1835932).

Almost surely, 2^19561223 is an apocalyptic number.

19561223 is a deficient number, since it is larger than the sum of its proper divisors (2469961).

19561223 is a wasteful number, since it uses less digits than its factorization.

19561223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006 (or 3995 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 19561223 is about 4422.8071402674. The cubic root of 19561223 is about 269.4420255692.

The spelling of 19561223 in words is "nineteen million, five hundred sixty-one thousand, two hundred twenty-three".