216769391 has 8 divisors (see below), whose sum is σ = 224083968. Its totient is φ = 209475000.

The previous prime is 216769381. The next prime is 216769393. The reversal of 216769391 is 193967612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216769391 - 2²² = 212575087 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 (216769393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18626 + ... + 27936.

It is an arithmetic number, because the mean of its divisors is an integer number (28010496).

Almost surely, 2^216769391 is an apocalyptic number.

216769391 is a deficient number, since it is larger than the sum of its proper divisors (7314577).

216769391 is an equidigital number, since it uses as much as digits as its factorization.

216769391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10093.

The product of its digits is 122472, while the sum is 44.

The square root of 216769391 is about 14723.0904024936. The cubic root of 216769391 is about 600.7115548899.

The spelling of 216769391 in words is "two hundred sixteen million, seven hundred sixty-nine thousand, three hundred ninety-one".