42217691 has 12 divisors (see below), whose sum is σ = 44041536. Its totient is φ = 40466160.

The previous prime is 42217663. The next prime is 42217699. The reversal of 42217691 is 19671224.

It is a happy number.

It is not a de Polignac number, because 42217691 - 2¹⁴ = 42201307 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42217699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189206 + ... + 189428.

It is an arithmetic number, because the mean of its divisors is an integer number (3670128).

Almost surely, 2^42217691 is an apocalyptic number.

42217691 is a deficient number, since it is larger than the sum of its proper divisors (1823845).

42217691 is a wasteful number, since it uses less digits than its factorization.

42217691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 451 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 42217691 is about 6497.5142169910. The cubic root of 42217691 is about 348.2021852133.

The spelling of 42217691 in words is "forty-two million, two hundred seventeen thousand, six hundred ninety-one".