42251917 has 2 divisors, whose sum is σ = 42251918. Its totient is φ = 42251916.

The previous prime is 42251903. The next prime is 42251933. The reversal of 42251917 is 71915224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41293476 + 958441 = 6426^2 + 979^2 .

It is a cyclic number.

It is not a de Polignac number, because 42251917 - 2⁷ = 42251789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42251947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21125958 + 21125959.

It is an arithmetic number, because the mean of its divisors is an integer number (21125959).

Almost surely, 2^42251917 is an apocalyptic number.

It is an amenable number.

42251917 is a deficient number, since it is larger than the sum of its proper divisors (1).

42251917 is an equidigital number, since it uses as much as digits as its factorization.

42251917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 42251917 is about 6500.1474598658. The cubic root of 42251917 is about 348.2962559581.

The spelling of 42251917 in words is "forty-two million, two hundred fifty-one thousand, nine hundred seventeen".