19561442 has 4 divisors (see below), whose sum is σ = 29342166. Its totient is φ = 9780720.

The previous prime is 19561439. The next prime is 19561459. The reversal of 19561442 is 24416591.

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

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 7789681 = 3431^2 + 2791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19561399 and 19561408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4890359 + ... + 4890362.

Almost surely, 2^19561442 is an apocalyptic number.

19561442 is a deficient number, since it is larger than the sum of its proper divisors (9780724).

19561442 is an equidigital number, since it uses as much as digits as its factorization.

19561442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9780723.

The product of its digits is 8640, while the sum is 32.

The square root of 19561442 is about 4422.8318982299. The cubic root of 19561442 is about 269.4430310889.

The spelling of 19561442 in words is "nineteen million, five hundred sixty-one thousand, four hundred forty-two".