216115197 has 4 divisors (see below), whose sum is σ = 288153600. Its totient is φ = 144076796.

The previous prime is 216115181. The next prime is 216115241. The reversal of 216115197 is 791511612.

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 216115197 - 2⁴ = 216115181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216115147) 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, 36019197 + ... + 36019202.

It is an arithmetic number, because the mean of its divisors is an integer number (72038400).

Almost surely, 2^216115197 is an apocalyptic number.

It is an amenable number.

216115197 is a deficient number, since it is larger than the sum of its proper divisors (72038403).

216115197 is an equidigital number, since it uses as much as digits as its factorization.

216115197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72038402.

The product of its digits is 3780, while the sum is 33.

The square root of 216115197 is about 14700.8570158341. The cubic root of 216115197 is about 600.1066449325.

The spelling of 216115197 in words is "two hundred sixteen million, one hundred fifteen thousand, one hundred ninety-seven".