19481971 has 4 divisors (see below), whose sum is σ = 19495944. Its totient is φ = 19468000.

The previous prime is 19481963. The next prime is 19482019. The reversal of 19481971 is 17918491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17918491 = 29 ⋅617879.

It is a cyclic number.

It is not a de Polignac number, because 19481971 - 2³ = 19481963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19481911) 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, 4630 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (4873986).

Almost surely, 2^19481971 is an apocalyptic number.

19481971 is a deficient number, since it is larger than the sum of its proper divisors (13973).

19481971 is a wasteful number, since it uses less digits than its factorization.

19481971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13972.

The product of its digits is 18144, while the sum is 40.

The square root of 19481971 is about 4413.8385788336. The cubic root of 19481971 is about 269.0776529408.

The spelling of 19481971 in words is "nineteen million, four hundred eighty-one thousand, nine hundred seventy-one".