19924291 has 2 divisors, whose sum is σ = 19924292. Its totient is φ = 19924290.

The previous prime is 19924283. The next prime is 19924327. The reversal of 19924291 is 19242991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19924291 - 2³ = 19924283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19924291.

It is not a weakly prime, because it can be changed into another prime (19924211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9962145 + 9962146.

It is an arithmetic number, because the mean of its divisors is an integer number (9962146).

Almost surely, 2^19924291 is an apocalyptic number.

19924291 is a deficient number, since it is larger than the sum of its proper divisors (1).

19924291 is an equidigital number, since it uses as much as digits as its factorization.

19924291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 19924291 is about 4463.6634057689. The cubic root of 19924291 is about 271.0988188249.

The spelling of 19924291 in words is "nineteen million, nine hundred twenty-four thousand, two hundred ninety-one".