216298791 has 12 divisors (see below), whose sum is σ = 323205480. Its totient is φ = 139226640.

The previous prime is 216298759. The next prime is 216298813. The reversal of 216298791 is 197892612.

It is not a de Polignac number, because 216298791 - 2⁵ = 216298759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216298721) 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, 414105 + ... + 414626.

It is an arithmetic number, because the mean of its divisors is an integer number (26933790).

Almost surely, 2^216298791 is an apocalyptic number.

216298791 is a deficient number, since it is larger than the sum of its proper divisors (106906689).

216298791 is a wasteful number, since it uses less digits than its factorization.

216298791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828766 (or 828763 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 216298791 is about 14707.1000200583. The cubic root of 216298791 is about 600.2765308649.

The spelling of 216298791 in words is "two hundred sixteen million, two hundred ninety-eight thousand, seven hundred ninety-one".