216243425 has 12 divisors (see below), whose sum is σ = 268373820. Its totient is φ = 172845120.

The previous prime is 216243421. The next prime is 216243439. The reversal of 216243425 is 524342612.

It can be written as a sum of positive squares in 6 ways, for example, as 81126049 + 135117376 = 9007^2 + 11624^2 .

It is not a de Polignac number, because 216243425 - 2² = 216243421 is a prime.

It is a super-2 number, since 2×216243425² = 93522437711461250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216243421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32699 + ... + 38751.

It is an arithmetic number, because the mean of its divisors is an integer number (22364485).

Almost surely, 2^216243425 is an apocalyptic number.

216243425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216243425 is a deficient number, since it is larger than the sum of its proper divisors (52130395).

216243425 is a wasteful number, since it uses less digits than its factorization.

216243425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7492 (or 7487 counting only the distinct ones).

The product of its digits is 11520, while the sum is 29.

The square root of 216243425 is about 14705.2176114466. The cubic root of 216243425 is about 600.2253089011.

The spelling of 216243425 in words is "two hundred sixteen million, two hundred forty-three thousand, four hundred twenty-five".