216437225 has 12 divisors (see below), whose sum is σ = 268619340. Its totient is φ = 172996800.

The previous prime is 216437201. The next prime is 216437261. The reversal of 216437225 is 522734612.

It can be written as a sum of positive squares in 6 ways, for example, as 14115049 + 202322176 = 3757^2 + 14224^2 .

It is not a de Polignac number, because 216437225 - 2¹⁶ = 216371689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216437191 and 216437200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31391 + ... + 37659.

It is an arithmetic number, because the mean of its divisors is an integer number (22384945).

Almost surely, 2^216437225 is an apocalyptic number.

216437225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216437225 is a deficient number, since it is larger than the sum of its proper divisors (52182115).

216437225 is a wasteful number, since it uses less digits than its factorization.

216437225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7660 (or 7655 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 216437225 is about 14711.8056335720. The cubic root of 216437225 is about 600.4045651134.

The spelling of 216437225 in words is "two hundred sixteen million, four hundred thirty-seven thousand, two hundred twenty-five".