16731225 has 48 divisors (see below), whose sum is σ = 35136640. Its totient is φ = 7646400.

The previous prime is 16731203. The next prime is 16731233. The reversal of 16731225 is 52213761.

It is a happy number.

It is not a de Polignac number, because 16731225 - 2¹⁹ = 16206937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2955 + ... + 6495.

Almost surely, 2^16731225 is an apocalyptic number.

16731225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16731225 is an abundant number, since it is smaller than the sum of its proper divisors (18405415).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16731225 is a wasteful number, since it uses less digits than its factorization.

16731225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3567 (or 3556 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 16731225 is about 4090.3820114997. The cubic root of 16731225 is about 255.7658636026.

Adding to 16731225 its reverse (52213761), we get a palindrome (68944986).

The spelling of 16731225 in words is "sixteen million, seven hundred thirty-one thousand, two hundred twenty-five".