16938161 has 4 divisors (see below), whose sum is σ = 17031924. Its totient is φ = 16844400.

The previous prime is 16938157. The next prime is 16938179. The reversal of 16938161 is 16183961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2383936 + 14554225 = 1544^2 + 3815^2 .

It is a cyclic number.

It is not a de Polignac number, because 16938161 - 2² = 16938157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16938191) 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, 46610 + ... + 46971.

It is an arithmetic number, because the mean of its divisors is an integer number (4257981).

Almost surely, 2^16938161 is an apocalyptic number.

It is an amenable number.

16938161 is a deficient number, since it is larger than the sum of its proper divisors (93763).

16938161 is an equidigital number, since it uses as much as digits as its factorization.

16938161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93762.

The product of its digits is 7776, while the sum is 35.

The square root of 16938161 is about 4115.5997132860. The cubic root of 16938161 is about 256.8160048076.

The spelling of 16938161 in words is "sixteen million, nine hundred thirty-eight thousand, one hundred sixty-one".