16975681 has 8 divisors (see below), whose sum is σ = 17474184. Its totient is φ = 16481280.

The previous prime is 16975663. The next prime is 16975697. The reversal of 16975681 is 18657961.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 34225 + 16941456 = 185^2 + 4116^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16975681 - 2⁵ = 16975649 is a prime.

It is a super-2 number, since 2×16975681² = 576347490827522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16975661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8665 + ... + 10441.

It is an arithmetic number, because the mean of its divisors is an integer number (2184273).

Almost surely, 2^16975681 is an apocalyptic number.

It is an amenable number.

16975681 is a deficient number, since it is larger than the sum of its proper divisors (498503).

16975681 is a wasteful number, since it uses less digits than its factorization.

16975681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051.

The product of its digits is 90720, while the sum is 43.

The square root of 16975681 is about 4120.1554582321. The cubic root of 16975681 is about 257.0054907556.

The spelling of 16975681 in words is "sixteen million, nine hundred seventy-five thousand, six hundred eighty-one".