42258581 has 4 divisors (see below), whose sum is σ = 42310752. Its totient is φ = 42206412.

The previous prime is 42258571. The next prime is 42258589. The reversal of 42258581 is 18585224.

It is a happy number.

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-42258581 is a prime.

It is a super-2 number, since 2×42258581² = 3571575336267122, 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 (42258589) 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, 24851 + ... + 26496.

It is an arithmetic number, because the mean of its divisors is an integer number (10577688).

Almost surely, 2^42258581 is an apocalyptic number.

It is an amenable number.

42258581 is a deficient number, since it is larger than the sum of its proper divisors (52171).

42258581 is an equidigital number, since it uses as much as digits as its factorization.

42258581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52170.

The product of its digits is 25600, while the sum is 35.

The square root of 42258581 is about 6500.6600434110. The cubic root of 42258581 is about 348.3145661666.

The spelling of 42258581 in words is "forty-two million, two hundred fifty-eight thousand, five hundred eighty-one".