9999555541 has 2 divisors, whose sum is σ = 9999555542. Its totient is φ = 9999555540.

The previous prime is 9999555491. The next prime is 9999555551. The reversal of 9999555541 is 1455559999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7487440900 + 2512114641 = 86530^2 + 50121^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999555541 - 2²⁹ = 9462684629 is a prime.

It is a super-2 number, since 2×9999555541² (a number of 21 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9999555541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999555551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999777770 + 4999777771.

It is an arithmetic number, because the mean of its divisors is an integer number (4999777771).

Almost surely, 2^9999555541 is an apocalyptic number.

It is an amenable number.

9999555541 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999555541 is an equidigital number, since it uses as much as digits as its factorization.

9999555541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16402500, while the sum is 61.

The square root of 9999555541 is about 99997.7776803065. Note that the first 3 decimals coincide. The cubic root of 9999555541 is about 2154.4027709627.

The spelling of 9999555541 in words is "nine billion, nine hundred ninety-nine million, five hundred fifty-five thousand, five hundred forty-one".