19997011 has 2 divisors, whose sum is σ = 19997012. Its totient is φ = 19997010.

The previous prime is 19996993. The next prime is 19997017. The reversal of 19997011 is 11079991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19997011 - 2¹¹ = 19994963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19997017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9998505 + 9998506.

It is an arithmetic number, because the mean of its divisors is an integer number (9998506).

Almost surely, 2^19997011 is an apocalyptic number.

19997011 is a deficient number, since it is larger than the sum of its proper divisors (1).

19997011 is an equidigital number, since it uses as much as digits as its factorization.

19997011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 37.

The square root of 19997011 is about 4471.8017621536. The cubic root of 19997011 is about 271.4282386620.

The spelling of 19997011 in words is "nineteen million, nine hundred ninety-seven thousand, eleven".