42122257 has 2 divisors, whose sum is σ = 42122258. Its totient is φ = 42122256.

The previous prime is 42122237. The next prime is 42122281. The reversal of 42122257 is 75222124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40947201 + 1175056 = 6399^2 + 1084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42122257 is a prime.

It is not a weakly prime, because it can be changed into another prime (42122207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061128 + 21061129.

It is an arithmetic number, because the mean of its divisors is an integer number (21061129).

Almost surely, 2^42122257 is an apocalyptic number.

It is an amenable number.

42122257 is a deficient number, since it is larger than the sum of its proper divisors (1).

42122257 is an equidigital number, since it uses as much as digits as its factorization.

42122257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 25.

The square root of 42122257 is about 6490.1661766090. The cubic root of 42122257 is about 347.9396144178.

The spelling of 42122257 in words is "forty-two million, one hundred twenty-two thousand, two hundred fifty-seven".