16261999 has 4 divisors (see below), whose sum is σ = 17512936. Its totient is φ = 15011064.

The previous prime is 16261997. The next prime is 16262003. The reversal of 16261999 is 99916261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16261999 - 2¹ = 16261997 is a prime.

It is a super-2 number, since 2×16261999² = 528905222952002, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16261997) 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, 625449 + ... + 625474.

It is an arithmetic number, because the mean of its divisors is an integer number (4378234).

Almost surely, 2^16261999 is an apocalyptic number.

16261999 is a deficient number, since it is larger than the sum of its proper divisors (1250937).

16261999 is a wasteful number, since it uses less digits than its factorization.

16261999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250936.

The product of its digits is 52488, while the sum is 43.

The square root of 16261999 is about 4032.6168922922. The cubic root of 16261999 is about 253.3521786919.

The spelling of 16261999 in words is "sixteen million, two hundred sixty-one thousand, nine hundred ninety-nine".