42226981 has 2 divisors, whose sum is σ = 42226982. Its totient is φ = 42226980.

The previous prime is 42226979. The next prime is 42227023. The reversal of 42226981 is 18962224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37625956 + 4601025 = 6134^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 42226981 - 2¹ = 42226979 is a prime.

It is a super-2 number, since 2×42226981² = 3566235848748722, which contains 22 as substring.

Together with 42226979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42226081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21113490 + 21113491.

It is an arithmetic number, because the mean of its divisors is an integer number (21113491).

Almost surely, 2^42226981 is an apocalyptic number.

It is an amenable number.

42226981 is a deficient number, since it is larger than the sum of its proper divisors (1).

42226981 is an equidigital number, since it uses as much as digits as its factorization.

42226981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 42226981 is about 6498.2290664457. The cubic root of 42226981 is about 348.2277239624.

The spelling of 42226981 in words is "forty-two million, two hundred twenty-six thousand, nine hundred eighty-one".