19434661 has 4 divisors (see below), whose sum is σ = 19753324. Its totient is φ = 19116000.

The previous prime is 19434643. The next prime is 19434671. The reversal of 19434661 is 16643491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16643491 = 229 ⋅72679.

It can be written as a sum of positive squares in 2 ways, for example, as 2910436 + 16524225 = 1706^2 + 4065^2 .

It is a cyclic number.

It is not a de Polignac number, because 19434661 - 2²³ = 11046053 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 (19434601) 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, 159240 + ... + 159361.

It is an arithmetic number, because the mean of its divisors is an integer number (4938331).

Almost surely, 2^19434661 is an apocalyptic number.

It is an amenable number.

19434661 is a deficient number, since it is larger than the sum of its proper divisors (318663).

19434661 is an equidigital number, since it uses as much as digits as its factorization.

19434661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318662.

The product of its digits is 15552, while the sum is 34.

The square root of 19434661 is about 4408.4760405383. The cubic root of 19434661 is about 268.8596670870.

The spelling of 19434661 in words is "nineteen million, four hundred thirty-four thousand, six hundred sixty-one".