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220931 is a prime number
BaseRepresentation
bin110101111100000011
3102020001122
4311330003
524032211
64422455
71610054
oct657403
9366048
10220931
11140a97
12a7a2b
1379739
145a72b
15456db
hex35f03

220931 has 2 divisors, whose sum is σ = 220932. Its totient is φ = 220930.

The previous prime is 220919. The next prime is 220933. The reversal of 220931 is 139022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-220931 is a prime.

It is a super-2 number, since 2×2209312 = 97621013522, which contains 22 as substring.

Together with 220933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110465 + 110466.

It is an arithmetic number, because the mean of its divisors is an integer number (110466).

2220931 is an apocalyptic number.

220931 is a deficient number, since it is larger than the sum of its proper divisors (1).

220931 is an equidigital number, since it uses as much as digits as its factorization.

220931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 220931 is about 470.0329775665. The cubic root of 220931 is about 60.4531431467.

Adding to 220931 its reverse (139022), we get a palindrome (359953).

The spelling of 220931 in words is "two hundred twenty thousand, nine hundred thirty-one".