8540003581 has 4 divisors (see below), whose sum is σ = 8540952064. Its totient is φ = 8539055100.

The previous prime is 8540003561. The next prime is 8540003617. The reversal of 8540003581 is 1853000458.

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 8540003581 - 2²⁷ = 8405785853 is a prime.

It is a super-2 number, since 2×8540003581² (a number of 21 digits) 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 (8540003531) 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, 460605 + ... + 478786.

It is an arithmetic number, because the mean of its divisors is an integer number (2135238016).

Almost surely, 2^8540003581 is an apocalyptic number.

It is an amenable number.

8540003581 is a deficient number, since it is larger than the sum of its proper divisors (948483).

8540003581 is an equidigital number, since it uses as much as digits as its factorization.

8540003581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948482.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 8540003581 is about 92412.1397923455. The cubic root of 8540003581 is about 2044.0241262217.

The spelling of 8540003581 in words is "eight billion, five hundred forty million, three thousand, five hundred eighty-one".