218572231 has 8 divisors (see below), whose sum is σ = 223432704. Its totient is φ = 213720600.

The previous prime is 218572183. The next prime is 218572241. The reversal of 218572231 is 132275812.

218572231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 218572231 - 2²¹ = 216475079 is a prime.

It is a super-2 number, since 2×218572231² = 95547640328634722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218572193 and 218572202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218572241) 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, 84406 + ... + 86956.

It is an arithmetic number, because the mean of its divisors is an integer number (27929088).

Almost surely, 2^218572231 is an apocalyptic number.

218572231 is a deficient number, since it is larger than the sum of its proper divisors (4860473).

218572231 is a wasteful number, since it uses less digits than its factorization.

218572231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4421.

The product of its digits is 6720, while the sum is 31.

The square root of 218572231 is about 14784.1885472284. The cubic root of 218572231 is about 602.3723033035.

The spelling of 218572231 in words is "two hundred eighteen million, five hundred seventy-two thousand, two hundred thirty-one".