16725121 has 12 divisors (see below), whose sum is σ = 19578132. Its totient is φ = 14245728.

The previous prime is 16725119. The next prime is 16725139. The reversal of 16725121 is 12152761.

It can be written as a sum of positive squares in 2 ways, for example, as 9834496 + 6890625 = 3136^2 + 2625^2 .

It is not a de Polignac number, because 16725121 - 2¹ = 16725119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16725421) 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 11 ways as a sum of consecutive naturals, for example, 7491 + ... + 9463.

It is an arithmetic number, because the mean of its divisors is an integer number (1631511).

Almost surely, 2^16725121 is an apocalyptic number.

It is an amenable number.

16725121 is a deficient number, since it is larger than the sum of its proper divisors (2853011).

16725121 is a wasteful number, since it uses less digits than its factorization.

16725121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160 (or 2153 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 16725121 is about 4089.6358028558. The cubic root of 16725121 is about 255.7347564019.

Adding to 16725121 its reverse (12152761), we get a palindrome (28877882).

The spelling of 16725121 in words is "sixteen million, seven hundred twenty-five thousand, one hundred twenty-one".