16945633 has 4 divisors (see below), whose sum is σ = 16955140. Its totient is φ = 16936128.

The previous prime is 16945631. The next prime is 16945639. The reversal of 16945633 is 33654961.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 33654961 = 47 ⋅716063.

It can be written as a sum of positive squares in 2 ways, for example, as 8720209 + 8225424 = 2953^2 + 2868^2 .

It is a 3-Lehmer number, since φ(16945633) divides (16945633-1)³.

It is a cyclic number.

It is not a de Polignac number, because 16945633 - 2¹ = 16945631 is a prime.

It is a deceptive number, since it divides R_16945632.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16945592 and 16945601.

It is not an unprimeable number, because it can be changed into a prime (16945631) 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, 1188 + ... + 5941.

It is an arithmetic number, because the mean of its divisors is an integer number (4238785).

Almost surely, 2^16945633 is an apocalyptic number.

16945633 is the 2377-th octagonal number.

It is an amenable number.

16945633 is a deficient number, since it is larger than the sum of its proper divisors (9507).

16945633 is an equidigital number, since it uses as much as digits as its factorization.

16945633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9506.

The product of its digits is 58320, while the sum is 37.

The square root of 16945633 is about 4116.5073788346. The cubic root of 16945633 is about 256.8537626864.

It can be divided in two parts, 16945 and 633, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 16945633 in words is "sixteen million, nine hundred forty-five thousand, six hundred thirty-three".