216197149 has 4 divisors (see below), whose sum is σ = 247082464. Its totient is φ = 185311836.

The previous prime is 216197147. The next prime is 216197153. The reversal of 216197149 is 941791612.

216197149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216197149 - 2¹ = 216197147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216197147) 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, 15442647 + ... + 15442660.

It is an arithmetic number, because the mean of its divisors is an integer number (61770616).

Almost surely, 2^216197149 is an apocalyptic number.

It is an amenable number.

216197149 is a deficient number, since it is larger than the sum of its proper divisors (30885315).

216197149 is an equidigital number, since it uses as much as digits as its factorization.

216197149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30885314.

The product of its digits is 27216, while the sum is 40.

The square root of 216197149 is about 14703.6440721340. The cubic root of 216197149 is about 600.1824898605.

The spelling of 216197149 in words is "two hundred sixteen million, one hundred ninety-seven thousand, one hundred forty-nine".