42242251 has 2 divisors, whose sum is σ = 42242252. Its totient is φ = 42242250.

The previous prime is 42242173. The next prime is 42242261. The reversal of 42242251 is 15224224.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42242251 is a prime.

It is not a weakly prime, because it can be changed into another prime (42242261) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21121125 + 21121126.

It is an arithmetic number, because the mean of its divisors is an integer number (21121126).

Almost surely, 2^42242251 is an apocalyptic number.

42242251 is a deficient number, since it is larger than the sum of its proper divisors (1).

42242251 is an equidigital number, since it uses as much as digits as its factorization.

42242251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 22.

The square root of 42242251 is about 6499.4038957431. The cubic root of 42242251 is about 348.2696939414.

Adding to 42242251 its reverse (15224224), we get a palindrome (57466475).

The spelling of 42242251 in words is "forty-two million, two hundred forty-two thousand, two hundred fifty-one".