1111555541 has 2 divisors, whose sum is σ = 1111555542. Its totient is φ = 1111555540.

The previous prime is 1111555439. The next prime is 1111555607. The reversal of 1111555541 is 1455551111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 983073316 + 128482225 = 31354^2 + 11335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111555541 - 2¹⁰ = 1111554517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111555241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555777770 + 555777771.

It is an arithmetic number, because the mean of its divisors is an integer number (555777771).

Almost surely, 2^1111555541 is an apocalyptic number.

It is an amenable number.

1111555541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111555541 is an equidigital number, since it uses as much as digits as its factorization.

1111555541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2500, while the sum is 29.

The square root of 1111555541 is about 33339.9991151770. Note that the first 3 decimals coincide. The cubic root of 1111555541 is about 1035.8822449431.

The spelling of 1111555541 in words is "one billion, one hundred eleven million, five hundred fifty-five thousand, five hundred forty-one".