19793971 has 2 divisors, whose sum is σ = 19793972. Its totient is φ = 19793970.

The previous prime is 19793947. The next prime is 19793987. The reversal of 19793971 is 17939791.

It is a strong prime.

It is an emirp because it is prime and its reverse (17939791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19793971 - 2¹¹ = 19791923 is a prime.

It is not a weakly prime, because it can be changed into another prime (19793911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9896985 + 9896986.

It is an arithmetic number, because the mean of its divisors is an integer number (9896986).

Almost surely, 2^19793971 is an apocalyptic number.

19793971 is a deficient number, since it is larger than the sum of its proper divisors (1).

19793971 is an equidigital number, since it uses as much as digits as its factorization.

19793971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107163, while the sum is 46.

The square root of 19793971 is about 4449.0415821837. The cubic root of 19793971 is about 270.5064613743.

The spelling of 19793971 in words is "nineteen million, seven hundred ninety-three thousand, nine hundred seventy-one".