216242497 has 4 divisors (see below), whose sum is σ = 216980820. Its totient is φ = 215504176.

The previous prime is 216242489. The next prime is 216242503. The reversal of 216242497 is 794242612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190191681 + 26050816 = 13791^2 + 5104^2 .

It is a cyclic number.

It is not a de Polignac number, because 216242497 - 2³ = 216242489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216242417) 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 3 ways as a sum of consecutive naturals, for example, 368722 + ... + 369307.

It is an arithmetic number, because the mean of its divisors is an integer number (54245205).

Almost surely, 2^216242497 is an apocalyptic number.

It is an amenable number.

216242497 is a deficient number, since it is larger than the sum of its proper divisors (738323).

216242497 is an equidigital number, since it uses as much as digits as its factorization.

216242497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738322.

The product of its digits is 48384, while the sum is 37.

The square root of 216242497 is about 14705.1860579865. The cubic root of 216242497 is about 600.2244502856.

The spelling of 216242497 in words is "two hundred sixteen million, two hundred forty-two thousand, four hundred ninety-seven".