216197 has 4 divisors (see below), whose sum is σ = 218400. Its totient is φ = 213996.

The previous prime is 216179. The next prime is 216211. The reversal of 216197 is 791612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216197 - 2⁶ = 216133 is a prime.

It is a super-2 number, since 2×216197² = 93482285618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (54600).

2²¹⁶¹⁹⁷ is an apocalyptic number.

It is an amenable number.

216197 is a deficient number, since it is larger than the sum of its proper divisors (2203).

216197 is a wasteful number, since it uses less digits than its factorization.

216197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202.

The product of its digits is 756, while the sum is 26.

The square root of 216197 is about 464.9698914984. The cubic root of 216197 is about 60.0182351981.

The spelling of 216197 in words is "two hundred sixteen thousand, one hundred ninety-seven".