42126517 has 2 divisors, whose sum is σ = 42126518. Its totient is φ = 42126516.

The previous prime is 42126503. The next prime is 42126521. The reversal of 42126517 is 71562124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39050001 + 3076516 = 6249^2 + 1754^2 .

It is a cyclic number.

It is not a de Polignac number, because 42126517 - 2⁷ = 42126389 is a prime.

It is a Chen prime.

It is equal to p_2554804 and since 42126517 and 2554804 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42120517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21063258 + 21063259.

It is an arithmetic number, because the mean of its divisors is an integer number (21063259).

Almost surely, 2^42126517 is an apocalyptic number.

It is an amenable number.

42126517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42126517 is an equidigital number, since it uses as much as digits as its factorization.

42126517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 42126517 is about 6490.4943571349. The cubic root of 42126517 is about 347.9513435518.

The spelling of 42126517 in words is "forty-two million, one hundred twenty-six thousand, five hundred seventeen".