2001355541 has 2 divisors, whose sum is σ = 2001355542. Its totient is φ = 2001355540.

The previous prime is 2001355483. The next prime is 2001355589. The reversal of 2001355541 is 1455531002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1701892516 + 299463025 = 41254^2 + 17305^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001355541 - 2¹⁴ = 2001339157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001355541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001355241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000677770 + 1000677771.

It is an arithmetic number, because the mean of its divisors is an integer number (1000677771).

Almost surely, 2^2001355541 is an apocalyptic number.

It is an amenable number.

2001355541 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001355541 is an equidigital number, since it uses as much as digits as its factorization.

2001355541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 2001355541 is about 44736.5123920048. The cubic root of 2001355541 is about 1260.2056313842.

Adding to 2001355541 its reverse (1455531002), we get a palindrome (3456886543).

The spelling of 2001355541 in words is "two billion, one million, three hundred fifty-five thousand, five hundred forty-one".