42217751 has 2 divisors, whose sum is σ = 42217752. Its totient is φ = 42217750.

The previous prime is 42217727. The next prime is 42217757. The reversal of 42217751 is 15771224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42217751 - 2¹⁸ = 41955607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42217757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21108875 + 21108876.

It is an arithmetic number, because the mean of its divisors is an integer number (21108876).

Almost surely, 2^42217751 is an apocalyptic number.

42217751 is a deficient number, since it is larger than the sum of its proper divisors (1).

42217751 is an equidigital number, since it uses as much as digits as its factorization.

42217751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 29.

The square root of 42217751 is about 6497.5188341397. The cubic root of 42217751 is about 348.2023501688.

Adding to 42217751 its reverse (15771224), we get a palindrome (57988975).

The spelling of 42217751 in words is "forty-two million, two hundred seventeen thousand, seven hundred fifty-one".