19516641 has 4 divisors (see below), whose sum is σ = 26022192. Its totient is φ = 13011092.

The previous prime is 19516633. The next prime is 19516657. The reversal of 19516641 is 14661591.

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 19516641 - 2³ = 19516633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19516621) 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, 3252771 + ... + 3252776.

It is an arithmetic number, because the mean of its divisors is an integer number (6505548).

Almost surely, 2^19516641 is an apocalyptic number.

It is an amenable number.

19516641 is a deficient number, since it is larger than the sum of its proper divisors (6505551).

19516641 is an equidigital number, since it uses as much as digits as its factorization.

19516641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6505550.

The product of its digits is 6480, while the sum is 33.

The square root of 19516641 is about 4417.7642535563. The cubic root of 19516641 is about 269.2371746817.

It can be divided in two parts, 195 and 16641, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 19516641 in words is "nineteen million, five hundred sixteen thousand, six hundred forty-one".