16381825 has 6 divisors (see below), whose sum is σ = 20313494. Its totient is φ = 13105440.

The previous prime is 16381801. The next prime is 16381847. The reversal of 16381825 is 52818361.

It can be written as a sum of positive squares in 3 ways, for example, as 27889 + 16353936 = 167^2 + 4044^2 .

It is not a de Polignac number, because 16381825 - 2¹¹ = 16379777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 327612 + ... + 327661.

Almost surely, 2^16381825 is an apocalyptic number.

It is an amenable number.

16381825 is a deficient number, since it is larger than the sum of its proper divisors (3931669).

16381825 is an equidigital number, since it uses as much as digits as its factorization.

16381825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655283 (or 655278 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 16381825 is about 4047.4467260237. The cubic root of 16381825 is about 253.9729288941.

The spelling of 16381825 in words is "sixteen million, three hundred eighty-one thousand, eight hundred twenty-five".