19902011 has 2 divisors, whose sum is σ = 19902012. Its totient is φ = 19902010.

The previous prime is 19901963. The next prime is 19902013. The reversal of 19902011 is 11020991.

It is a strong prime.

It is an emirp because it is prime and its reverse (11020991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19902011 - 2¹⁰ = 19900987 is a prime.

Together with 19902013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19902013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9951005 + 9951006.

It is an arithmetic number, because the mean of its divisors is an integer number (9951006).

Almost surely, 2^19902011 is an apocalyptic number.

19902011 is a deficient number, since it is larger than the sum of its proper divisors (1).

19902011 is an equidigital number, since it uses as much as digits as its factorization.

19902011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 19902011 is about 4461.1669997883. The cubic root of 19902011 is about 270.9977305856.

The spelling of 19902011 in words is "nineteen million, nine hundred two thousand, eleven".