42272231 has 2 divisors, whose sum is σ = 42272232. Its totient is φ = 42272230.

The previous prime is 42272213. The next prime is 42272233. The reversal of 42272231 is 13227224.

It is a happy number.

Together with previous prime (42272213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42272231 is a prime.

It is a super-2 number, since 2×42272231² = 3573883027434722, which contains 22 as substring.

Together with 42272233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42272197 and 42272206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42272233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21136115 + 21136116.

It is an arithmetic number, because the mean of its divisors is an integer number (21136116).

Almost surely, 2^42272231 is an apocalyptic number.

42272231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42272231 is an equidigital number, since it uses as much as digits as its factorization.

42272231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 23.

The square root of 42272231 is about 6501.7098520312. The cubic root of 42272231 is about 348.3520653118.

Adding to 42272231 its reverse (13227224), we get a palindrome (55499455).

It can be divided in two parts, 4227223 and 1, that added together give a palindrome (4227224).

The spelling of 42272231 in words is "forty-two million, two hundred seventy-two thousand, two hundred thirty-one".