16201891 has 2 divisors, whose sum is σ = 16201892. Its totient is φ = 16201890.

The previous prime is 16201883. The next prime is 16201897. The reversal of 16201891 is 19810261.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19810261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16201891 - 2³ = 16201883 is a prime.

It is not a weakly prime, because it can be changed into another prime (16201897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8100945 + 8100946.

It is an arithmetic number, because the mean of its divisors is an integer number (8100946).

Almost surely, 2^16201891 is an apocalyptic number.

16201891 is a deficient number, since it is larger than the sum of its proper divisors (1).

16201891 is an equidigital number, since it uses as much as digits as its factorization.

16201891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 16201891 is about 4025.1572640085. The cubic root of 16201891 is about 253.0396444616.

The spelling of 16201891 in words is "sixteen million, two hundred one thousand, eight hundred ninety-one".