42217493 has 2 divisors, whose sum is σ = 42217494. Its totient is φ = 42217492.

The previous prime is 42217471. The next prime is 42217507. The reversal of 42217493 is 39471224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41964484 + 253009 = 6478^2 + 503^2 .

It is a cyclic number.

It is not a de Polignac number, because 42217493 - 2⁸ = 42217237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42217423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21108746 + 21108747.

It is an arithmetic number, because the mean of its divisors is an integer number (21108747).

Almost surely, 2^42217493 is an apocalyptic number.

It is an amenable number.

42217493 is a deficient number, since it is larger than the sum of its proper divisors (1).

42217493 is an equidigital number, since it uses as much as digits as its factorization.

42217493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 42217493 is about 6497.4989803770. The cubic root of 42217493 is about 348.2016408590.

The spelling of 42217493 in words is "forty-two million, two hundred seventeen thousand, four hundred ninety-three".