220231031 has 4 divisors (see below), whose sum is σ = 222501552. Its totient is φ = 217960512.

The previous prime is 220231027. The next prime is 220231057. The reversal of 220231031 is 130132022.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 220231031 - 2² = 220231027 is a prime.

It is a super-2 number, since 2×220231031² = 97003414030645922, 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 = 220230997 and 220231015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220231001) 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, 1135115 + ... + 1135308.

It is an arithmetic number, because the mean of its divisors is an integer number (55625388).

Almost surely, 2^220231031 is an apocalyptic number.

220231031 is a deficient number, since it is larger than the sum of its proper divisors (2270521).

220231031 is an equidigital number, since it uses as much as digits as its factorization.

220231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270520.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 220231031 is about 14840.1829840471. The cubic root of 220231031 is about 603.8923164826.

Adding to 220231031 its reverse (130132022), we get a palindrome (350363053).

Subtracting from 220231031 its reverse (130132022), we obtain a palindrome (90099009).

It can be divided in two parts, 2202 and 31031, that added together give a palindrome (33233).

The spelling of 220231031 in words is "two hundred twenty million, two hundred thirty-one thousand, thirty-one".