16266981 has 4 divisors (see below), whose sum is σ = 21689312. Its totient is φ = 10844652.

The previous prime is 16266967. The next prime is 16266989. The reversal of 16266981 is 18966261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16266981 - 2⁶ = 16266917 is a prime.

It is a super-2 number, since 2×16266981² = 529229341708722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16266989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2711161 + ... + 2711166.

It is an arithmetic number, because the mean of its divisors is an integer number (5422328).

Almost surely, 2^16266981 is an apocalyptic number.

It is an amenable number.

16266981 is a deficient number, since it is larger than the sum of its proper divisors (5422331).

16266981 is an equidigital number, since it uses as much as digits as its factorization.

16266981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5422330.

The product of its digits is 31104, while the sum is 39.

The square root of 16266981 is about 4033.2345580192. The cubic root of 16266981 is about 253.3780482397.

The spelling of 16266981 in words is "sixteen million, two hundred sixty-six thousand, nine hundred eighty-one".