4041540561 has 4 divisors (see below), whose sum is σ = 5388720752. Its totient is φ = 2694360372.

The previous prime is 4041540499. The next prime is 4041540583. The reversal of 4041540561 is 1650451404.

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 not a de Polignac number, because 4041540561 - 2⁹ = 4041540049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4041540161) 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, 673590091 + ... + 673590096.

It is an arithmetic number, because the mean of its divisors is an integer number (1347180188).

Almost surely, 2^4041540561 is an apocalyptic number.

It is an amenable number.

4041540561 is a deficient number, since it is larger than the sum of its proper divisors (1347180191).

4041540561 is a wasteful number, since it uses less digits than its factorization.

4041540561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347180190.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 4041540561 is about 63573.1119342132. Note that the first 3 decimals coincide. The cubic root of 4041540561 is about 1592.8772659277.

Adding to 4041540561 its reverse (1650451404), we get a palindrome (5691991965).

The spelling of 4041540561 in words is "four billion, forty-one million, five hundred forty thousand, five hundred sixty-one".