16111225 has 24 divisors (see below), whose sum is σ = 21795480. Its totient is φ = 11742720.

The previous prime is 16111171. The next prime is 16111241. The reversal of 16111225 is 52211161.

It can be written as a sum of positive squares in 12 ways, for example, as 13278736 + 2832489 = 3644^2 + 1683^2 .

It is not a de Polignac number, because 16111225 - 2²¹ = 14014073 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28647 + ... + 29203.

It is an arithmetic number, because the mean of its divisors is an integer number (908145).

Almost surely, 2^16111225 is an apocalyptic number.

It is an amenable number.

16111225 is a deficient number, since it is larger than the sum of its proper divisors (5684255).

16111225 is a wasteful number, since it uses less digits than its factorization.

16111225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 664 counting only the distinct ones).

The product of its digits is 120, while the sum is 19.

The square root of 16111225 is about 4013.8790465085. The cubic root of 16111225 is about 252.5667568483.

Adding to 16111225 its reverse (52211161), we get a palindrome (68322386).

The spelling of 16111225 in words is "sixteen million, one hundred eleven thousand, two hundred twenty-five".