16199891 has 2 divisors, whose sum is σ = 16199892. Its totient is φ = 16199890.

The previous prime is 16199867. The next prime is 16199899. The reversal of 16199891 is 19899161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16199891 is a prime.

It is not a weakly prime, because it can be changed into another prime (16199899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8099945 + 8099946.

It is an arithmetic number, because the mean of its divisors is an integer number (8099946).

Almost surely, 2^16199891 is an apocalyptic number.

16199891 is a deficient number, since it is larger than the sum of its proper divisors (1).

16199891 is an equidigital number, since it uses as much as digits as its factorization.

16199891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 44.

The square root of 16199891 is about 4024.9088188430. The cubic root of 16199891 is about 253.0292320944.

The spelling of 16199891 in words is "sixteen million, one hundred ninety-nine thousand, eight hundred ninety-one".