1111155559 has 2 divisors, whose sum is σ = 1111155560. Its totient is φ = 1111155558.

The previous prime is 1111155541. The next prime is 1111155569. The reversal of 1111155559 is 9555511111.

It is a strong prime.

It is an emirp because it is prime and its reverse (9555511111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111155559 - 2⁵ = 1111155527 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111155509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555577779 + 555577780.

It is an arithmetic number, because the mean of its divisors is an integer number (555577780).

Almost surely, 2^1111155559 is an apocalyptic number.

1111155559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111155559 is an equidigital number, since it uses as much as digits as its factorization.

1111155559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5625, while the sum is 34.

The square root of 1111155559 is about 33334.0000449991. Note that the first 4 decimals coincide. The cubic root of 1111155559 is about 1035.7579794596.

The spelling of 1111155559 in words is "one billion, one hundred eleven million, one hundred fifty-five thousand, five hundred fifty-nine".