4001205541 has 2 divisors, whose sum is σ = 4001205542. Its totient is φ = 4001205540.

The previous prime is 4001205517. The next prime is 4001205553. The reversal of 4001205541 is 1455021004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3965850625 + 35354916 = 62975^2 + 5946^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001205541 - 2⁹ = 4001205029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4001203541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000602770 + 2000602771.

It is an arithmetic number, because the mean of its divisors is an integer number (2000602771).

Almost surely, 2^4001205541 is an apocalyptic number.

It is an amenable number.

4001205541 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001205541 is an equidigital number, since it uses as much as digits as its factorization.

4001205541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 4001205541 is about 63255.0831238091. The cubic root of 4001205541 is about 1587.5605090376.

Adding to 4001205541 its reverse (1455021004), we get a palindrome (5456226545).

The spelling of 4001205541 in words is "four billion, one million, two hundred five thousand, five hundred forty-one".