220131231 has 8 divisors (see below), whose sum is σ = 293582640. Its totient is φ = 146716992.

The previous prime is 220131227. The next prime is 220131239. The reversal of 220131231 is 132131022.

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

It is not a de Polignac number, because 220131231 - 2² = 220131227 is a prime.

It is a super-2 number, since 2×220131231² = 96915517723150722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220131231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220131239) 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, 10635 + ... + 23523.

It is an arithmetic number, because the mean of its divisors is an integer number (36697830).

Almost surely, 2^220131231 is an apocalyptic number.

220131231 is a deficient number, since it is larger than the sum of its proper divisors (73451409).

220131231 is a wasteful number, since it uses less digits than its factorization.

220131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18585.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 220131231 is about 14836.8201107919. The cubic root of 220131231 is about 603.8010826558.

Adding to 220131231 its reverse (132131022), we get a palindrome (352262253).

The spelling of 220131231 in words is "two hundred twenty million, one hundred thirty-one thousand, two hundred thirty-one".