19434561 has 4 divisors (see below), whose sum is σ = 25912752. Its totient is φ = 12956372.

The previous prime is 19434557. The next prime is 19434589. The reversal of 19434561 is 16543491.

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 a cyclic number.

It is not a de Polignac number, because 19434561 - 2² = 19434557 is a prime.

It is a super-2 number, since 2×19434561² = 755404322525442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19434161) 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, 3239091 + ... + 3239096.

It is an arithmetic number, because the mean of its divisors is an integer number (6478188).

Almost surely, 2^19434561 is an apocalyptic number.

It is an amenable number.

19434561 is a deficient number, since it is larger than the sum of its proper divisors (6478191).

19434561 is an equidigital number, since it uses as much as digits as its factorization.

19434561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6478190.

The product of its digits is 12960, while the sum is 33.

The square root of 19434561 is about 4408.4646987358. The cubic root of 19434561 is about 268.8592059519.

The spelling of 19434561 in words is "nineteen million, four hundred thirty-four thousand, five hundred sixty-one".