16266391 has 4 divisors (see below), whose sum is σ = 16279000. Its totient is φ = 16253784.

The previous prime is 16266379. The next prime is 16266407. The reversal of 16266391 is 19366261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19366261 = 233 ⋅83117.

It is a cyclic number.

It is not a de Polignac number, because 16266391 - 2¹¹ = 16264343 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 (16266311) 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 in 3 ways as a sum of consecutive naturals, for example, 4116 + ... + 7033.

It is an arithmetic number, because the mean of its divisors is an integer number (4069750).

Almost surely, 2^16266391 is an apocalyptic number.

16266391 is a deficient number, since it is larger than the sum of its proper divisors (12609).

16266391 is a wasteful number, since it uses less digits than its factorization.

16266391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12608.

The product of its digits is 11664, while the sum is 34.

The square root of 16266391 is about 4033.1614150688. The cubic root of 16266391 is about 253.3749848798.

The spelling of 16266391 in words is "sixteen million, two hundred sixty-six thousand, three hundred ninety-one".