19561413 has 4 divisors (see below), whose sum is σ = 26081888. Its totient is φ = 13040940.

The previous prime is 19561369. The next prime is 19561417. The reversal of 19561413 is 31416591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 19561413 - 2²¹ = 17464261 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 (19561417) 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, 3260233 + ... + 3260238.

It is an arithmetic number, because the mean of its divisors is an integer number (6520472).

Almost surely, 2^19561413 is an apocalyptic number.

It is an amenable number.

19561413 is a deficient number, since it is larger than the sum of its proper divisors (6520475).

19561413 is an equidigital number, since it uses as much as digits as its factorization.

19561413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6520474.

The product of its digits is 3240, while the sum is 30.

The square root of 19561413 is about 4422.8286197862. The cubic root of 19561413 is about 269.4428979383.

The spelling of 19561413 in words is "nineteen million, five hundred sixty-one thousand, four hundred thirteen".