220312231 has 4 divisors (see below), whose sum is σ = 233271792. Its totient is φ = 207352672.

The previous prime is 220312187. The next prime is 220312237. The reversal of 220312231 is 132213022.

220312231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 220312231 - 2⁹ = 220311719 is a prime.

It is a super-2 number, since 2×220312231² = 97074958256394722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220312237) 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, 6479755 + ... + 6479788.

It is an arithmetic number, because the mean of its divisors is an integer number (58317948).

Almost surely, 2^220312231 is an apocalyptic number.

220312231 is a deficient number, since it is larger than the sum of its proper divisors (12959561).

220312231 is a wasteful number, since it uses less digits than its factorization.

220312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12959560.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 220312231 is about 14842.9185472400. The cubic root of 220312231 is about 603.9665264770.

Adding to 220312231 its reverse (132213022), we get a palindrome (352525253).

The spelling of 220312231 in words is "two hundred twenty million, three hundred twelve thousand, two hundred thirty-one".