19648091 has 4 divisors (see below), whose sum is σ = 19690632. Its totient is φ = 19605552.

The previous prime is 19648087. The next prime is 19648099. The reversal of 19648091 is 19084691.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19648091 - 2² = 19648087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19648099) 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, 20570 + ... + 21503.

It is an arithmetic number, because the mean of its divisors is an integer number (4922658).

Almost surely, 2^19648091 is an apocalyptic number.

19648091 is a deficient number, since it is larger than the sum of its proper divisors (42541).

19648091 is an equidigital number, since it uses as much as digits as its factorization.

19648091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42540.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 19648091 is about 4432.6167215314. The cubic root of 19648091 is about 269.8402850567.

The spelling of 19648091 in words is "nineteen million, six hundred forty-eight thousand, ninety-one".