42606581 has 4 divisors (see below), whose sum is σ = 43513152. Its totient is φ = 41700012.

The previous prime is 42606563. The next prime is 42606583. The reversal of 42606581 is 18560624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42606581 is a prime.

It is a super-2 number, since 2×42606581² = 3630641489019122, 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 (42606583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453215 + ... + 453308.

It is an arithmetic number, because the mean of its divisors is an integer number (10878288).

Almost surely, 2^42606581 is an apocalyptic number.

It is an amenable number.

42606581 is a deficient number, since it is larger than the sum of its proper divisors (906571).

42606581 is an equidigital number, since it uses as much as digits as its factorization.

42606581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906570.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 42606581 is about 6527.3716762568. The cubic root of 42606581 is about 349.2680786334.

The spelling of 42606581 in words is "forty-two million, six hundred six thousand, five hundred eighty-one".