216291323 has 4 divisors (see below), whose sum is σ = 229014360. Its totient is φ = 203568288.

The previous prime is 216291311. The next prime is 216291373. The reversal of 216291323 is 323192612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216291323 - 2⁸ = 216291067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216291373) 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, 6361493 + ... + 6361526.

It is an arithmetic number, because the mean of its divisors is an integer number (57253590).

Almost surely, 2^216291323 is an apocalyptic number.

216291323 is a deficient number, since it is larger than the sum of its proper divisors (12723037).

216291323 is a wasteful number, since it uses less digits than its factorization.

216291323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12723036.

The product of its digits is 3888, while the sum is 29.

The square root of 216291323 is about 14706.8461268893. The cubic root of 216291323 is about 600.2696223400.

The spelling of 216291323 in words is "two hundred sixteen million, two hundred ninety-one thousand, three hundred twenty-three".