16191001 has 2 divisors, whose sum is σ = 16191002. Its totient is φ = 16191000.

The previous prime is 16190981. The next prime is 16191029. The reversal of 16191001 is 10019161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9030025 + 7160976 = 3005^2 + 2676^2 .

It is an emirp because it is prime and its reverse (10019161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16191001 - 2¹³ = 16182809 is a prime.

It is a super-3 number, since 3×16191001³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16191001.

It is not a weakly prime, because it can be changed into another prime (16191041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8095500 + 8095501.

It is an arithmetic number, because the mean of its divisors is an integer number (8095501).

Almost surely, 2^16191001 is an apocalyptic number.

16191001 is the 1800-th centered decagonal number.

It is an amenable number.

16191001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16191001 is an equidigital number, since it uses as much as digits as its factorization.

16191001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 16191001 is about 4023.8042944457. The cubic root of 16191001 is about 252.9829387486.

The spelling of 16191001 in words is "sixteen million, one hundred ninety-one thousand, one".