216264869 has 4 divisors (see below), whose sum is σ = 218286144. Its totient is φ = 214243596.

The previous prime is 216264823. The next prime is 216264901. The reversal of 216264869 is 968462612.

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 216264869 - 2⁸ = 216264613 is a prime.

It is a super-2 number, since 2×216264869² = 93540987127174322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216264569) 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, 1010477 + ... + 1010690.

It is an arithmetic number, because the mean of its divisors is an integer number (54571536).

Almost surely, 2^216264869 is an apocalyptic number.

It is an amenable number.

216264869 is a deficient number, since it is larger than the sum of its proper divisors (2021275).

216264869 is a wasteful number, since it uses less digits than its factorization.

216264869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021274.

The product of its digits is 248832, while the sum is 44.

The square root of 216264869 is about 14705.9467223297. The cubic root of 216264869 is about 600.2451488971.

The spelling of 216264869 in words is "two hundred sixteen million, two hundred sixty-four thousand, eight hundred sixty-nine".