42422981 has 2 divisors, whose sum is σ = 42422982. Its totient is φ = 42422980.

The previous prime is 42422959. The next prime is 42423011. The reversal of 42422981 is 18922424.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39753025 + 2669956 = 6305^2 + 1634^2 .

It is a cyclic number.

It is not a de Polignac number, because 42422981 - 2⁶ = 42422917 is a prime.

It is a super-2 number, since 2×42422981² = 3599418633852722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42422581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21211490 + 21211491.

It is an arithmetic number, because the mean of its divisors is an integer number (21211491).

Almost surely, 2^42422981 is an apocalyptic number.

It is an amenable number.

42422981 is a deficient number, since it is larger than the sum of its proper divisors (1).

42422981 is an equidigital number, since it uses as much as digits as its factorization.

42422981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 32.

The square root of 42422981 is about 6513.2926389039. The cubic root of 42422981 is about 348.7656683736.

The spelling of 42422981 in words is "forty-two million, four hundred twenty-two thousand, nine hundred eighty-one".