16681497 has 16 divisors (see below), whose sum is σ = 25522560. Its totient is φ = 9493632.

The previous prime is 16681493. The next prime is 16681499. The reversal of 16681497 is 79418661.

It is not a de Polignac number, because 16681497 - 2² = 16681493 is a prime.

It is a super-2 number, since 2×16681497² = 556544684322018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16681493) 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 15 ways as a sum of consecutive naturals, for example, 4173 + ... + 7125.

It is an arithmetic number, because the mean of its divisors is an integer number (1595160).

Almost surely, 2^16681497 is an apocalyptic number.

It is an amenable number.

16681497 is a deficient number, since it is larger than the sum of its proper divisors (8841063).

16681497 is a wasteful number, since it uses less digits than its factorization.

16681497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232.

The product of its digits is 72576, while the sum is 42.

The square root of 16681497 is about 4084.2988382340. The cubic root of 16681497 is about 255.5122191656.

The spelling of 16681497 in words is "sixteen million, six hundred eighty-one thousand, four hundred ninety-seven".