216434523 has 8 divisors (see below), whose sum is σ = 295290688. Its totient is φ = 140934024.

The previous prime is 216434509. The next prime is 216434549. The reversal of 216434523 is 325434612.

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

It is not a de Polignac number, because 216434523 - 2⁴ = 216434507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216434503) 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, 838765 + ... + 839022.

It is an arithmetic number, because the mean of its divisors is an integer number (36911336).

Almost surely, 2^216434523 is an apocalyptic number.

216434523 is a deficient number, since it is larger than the sum of its proper divisors (78856165).

216434523 is a wasteful number, since it uses less digits than its factorization.

216434523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677833.

The product of its digits is 17280, while the sum is 30.

The square root of 216434523 is about 14711.7138022733. The cubic root of 216434523 is about 600.4020666216.

The spelling of 216434523 in words is "two hundred sixteen million, four hundred thirty-four thousand, five hundred twenty-three".