16972691 has 4 divisors (see below), whose sum is σ = 16992312. Its totient is φ = 16953072.

The previous prime is 16972679. The next prime is 16972693. The reversal of 16972691 is 19627961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19627961 = 2347 ⋅8363.

It is a cyclic number.

It is not a de Polignac number, because 16972691 - 2¹⁰ = 16971667 is a prime.

It is a super-3 number, since 3×16972691³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16972693) 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 3 ways as a sum of consecutive naturals, for example, 8450 + ... + 10263.

It is an arithmetic number, because the mean of its divisors is an integer number (4248078).

Almost surely, 2^16972691 is an apocalyptic number.

16972691 is a deficient number, since it is larger than the sum of its proper divisors (19621).

16972691 is an equidigital number, since it uses as much as digits as its factorization.

16972691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19620.

The product of its digits is 40824, while the sum is 41.

The square root of 16972691 is about 4119.7925918667. The cubic root of 16972691 is about 256.9904007073.

The spelling of 16972691 in words is "sixteen million, nine hundred seventy-two thousand, six hundred ninety-one".