42711581 has 4 divisors (see below), whose sum is σ = 46594464. Its totient is φ = 38828700.

The previous prime is 42711533. The next prime is 42711607. The reversal of 42711581 is 18511724.

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 not a de Polignac number, because 42711581 - 2¹⁴ = 42695197 is a prime.

It is a super-2 number, since 2×42711581² = 3648558303039122, 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 (42711181) 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, 1941425 + ... + 1941446.

It is an arithmetic number, because the mean of its divisors is an integer number (11648616).

Almost surely, 2^42711581 is an apocalyptic number.

It is an amenable number.

42711581 is a deficient number, since it is larger than the sum of its proper divisors (3882883).

42711581 is a wasteful number, since it uses less digits than its factorization.

42711581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3882882.

The product of its digits is 2240, while the sum is 29.

The square root of 42711581 is about 6535.4097805723. The cubic root of 42711581 is about 349.5547562835.

The spelling of 42711581 in words is "forty-two million, seven hundred eleven thousand, five hundred eighty-one".