42692581 has 4 divisors (see below), whose sum is σ = 42728332. Its totient is φ = 42656832.

The previous prime is 42692579. The next prime is 42692621. The reversal of 42692581 is 18529624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35212356 + 7480225 = 5934^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 42692581 - 2¹ = 42692579 is a prime.

It is a super-2 number, since 2×42692581² = 3645312944883122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42692581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42696581) 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, 16020 + ... + 18493.

It is an arithmetic number, because the mean of its divisors is an integer number (10682083).

Almost surely, 2^42692581 is an apocalyptic number.

It is an amenable number.

42692581 is a deficient number, since it is larger than the sum of its proper divisors (35751).

42692581 is a wasteful number, since it uses less digits than its factorization.

42692581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35750.

The product of its digits is 34560, while the sum is 37.

The square root of 42692581 is about 6533.9559992397. The cubic root of 42692581 is about 349.5029161247.

The spelling of 42692581 in words is "forty-two million, six hundred ninety-two thousand, five hundred eighty-one".