16111997 has 6 divisors (see below), whose sum is σ = 17710014. Its totient is φ = 14647160.

The previous prime is 16111987. The next prime is 16111999. The reversal of 16111997 is 79911161.

It can be written as a sum of positive squares in only one way, i.e., 9084196 + 7027801 = 3014^2 + 2651^2 .

It is not a de Polignac number, because 16111997 - 2⁶ = 16111933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16111999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66458 + ... + 66699.

It is an arithmetic number, because the mean of its divisors is an integer number (2951669).

Almost surely, 2^16111997 is an apocalyptic number.

It is an amenable number.

16111997 is a deficient number, since it is larger than the sum of its proper divisors (1598017).

16111997 is a wasteful number, since it uses less digits than its factorization.

16111997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133179 (or 133168 counting only the distinct ones).

The product of its digits is 3402, while the sum is 35.

The square root of 16111997 is about 4013.9752116823. The cubic root of 16111997 is about 252.5707908561.

The spelling of 16111997 in words is "sixteen million, one hundred eleven thousand, nine hundred ninety-seven".