19468661 has 4 divisors (see below), whose sum is σ = 19687500. Its totient is φ = 19249824.

The previous prime is 19468639. The next prime is 19468667. The reversal of 19468661 is 16686491.

19468661 = 423² + 424² + ... + 511².

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

It can be written as a sum of positive squares in 2 ways, for example, as 7806436 + 11662225 = 2794^2 + 3415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19468661 is a prime.

It is a super-2 number, since 2×19468661² = 758057522265842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19468667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109286 + ... + 109463.

It is an arithmetic number, because the mean of its divisors is an integer number (4921875).

Almost surely, 2^19468661 is an apocalyptic number.

It is an amenable number.

19468661 is a deficient number, since it is larger than the sum of its proper divisors (218839).

19468661 is an equidigital number, since it uses as much as digits as its factorization.

19468661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218838.

The product of its digits is 62208, while the sum is 41.

The square root of 19468661 is about 4412.3305633191. The cubic root of 19468661 is about 269.0163614100.

The spelling of 19468661 in words is "nineteen million, four hundred sixty-eight thousand, six hundred sixty-one".