1155055511 has 2 divisors, whose sum is σ = 1155055512. Its totient is φ = 1155055510.

The previous prime is 1155055459. The next prime is 1155055513. The reversal of 1155055511 is 1155505511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155055511 is a prime.

It is a super-2 number, since 2×1155055511² = 2668306466982942242, which contains 22 as substring.

Together with 1155055513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155055513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577527755 + 577527756.

It is an arithmetic number, because the mean of its divisors is an integer number (577527756).

Almost surely, 2^1155055511 is an apocalyptic number.

1155055511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155055511 is an equidigital number, since it uses as much as digits as its factorization.

1155055511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3125, while the sum is 29.

The square root of 1155055511 is about 33986.1076176723. The cubic root of 1155055511 is about 1049.2225570838. Note that the first 3 decimals are identical.

The spelling of 1155055511 in words is "one billion, one hundred fifty-five million, fifty-five thousand, five hundred eleven".