42164581 has 8 divisors (see below), whose sum is σ = 43263360. Its totient is φ = 41080032.

The previous prime is 42164561. The next prime is 42164597. The reversal of 42164581 is 18546124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42164581 - 2¹⁵ = 42131813 is a prime.

It is a super-2 number, since 2×42164581² = 3555703781811122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42164531) 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 7 ways as a sum of consecutive naturals, for example, 2580 + ... + 9538.

It is an arithmetic number, because the mean of its divisors is an integer number (5407920).

Almost surely, 2^42164581 is an apocalyptic number.

It is an amenable number.

42164581 is a deficient number, since it is larger than the sum of its proper divisors (1098779).

42164581 is an equidigital number, since it uses as much as digits as its factorization.

42164581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7115.

The product of its digits is 7680, while the sum is 31.

The square root of 42164581 is about 6493.4259832541. The cubic root of 42164581 is about 348.0561107612.

The spelling of 42164581 in words is "forty-two million, one hundred sixty-four thousand, five hundred eighty-one".