16891825 has 12 divisors (see below), whose sum is σ = 21067228. Its totient is φ = 13435200.

The previous prime is 16891813. The next prime is 16891841. The reversal of 16891825 is 52819861.

It can be written as a sum of positive squares in 6 ways, for example, as 3297856 + 13593969 = 1816^2 + 3687^2 .

It is not a de Polignac number, because 16891825 - 2⁵ = 16891793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2659 + ... + 6391.

Almost surely, 2^16891825 is an apocalyptic number.

It is an amenable number.

16891825 is a deficient number, since it is larger than the sum of its proper divisors (4175403).

16891825 is a wasteful number, since it uses less digits than its factorization.

16891825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924 (or 3919 counting only the distinct ones).

The product of its digits is 34560, while the sum is 40.

The square root of 16891825 is about 4109.9665448760. The cubic root of 16891825 is about 256.5816091538.

Subtracting 16891825 from its reverse (52819861), we obtain a square (35928036 = 5994²).

The spelling of 16891825 in words is "sixteen million, eight hundred ninety-one thousand, eight hundred twenty-five".