16681369 has 12 divisors (see below), whose sum is σ = 17871084. Its totient is φ = 15567104.

The previous prime is 16681363. The next prime is 16681397. The reversal of 16681369 is 96318661.

It can be written as a sum of positive squares in 6 ways, for example, as 10112400 + 6568969 = 3180^2 + 2563^2 .

It is not a de Polignac number, because 16681369 - 2³ = 16681361 is a prime.

It is a super-2 number, since 2×16681369² = 556536143428322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16681361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56787 + ... + 57079.

It is an arithmetic number, because the mean of its divisors is an integer number (1489257).

Almost surely, 2^16681369 is an apocalyptic number.

It is an amenable number.

16681369 is a deficient number, since it is larger than the sum of its proper divisors (1189715).

16681369 is a wasteful number, since it uses less digits than its factorization.

16681369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 507 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 16681369 is about 4084.2831684397. The cubic root of 16681369 is about 255.5115656342.

The spelling of 16681369 in words is "sixteen million, six hundred eighty-one thousand, three hundred sixty-nine".