1011055511 has 4 divisors (see below), whose sum is σ = 1018773624. Its totient is φ = 1003337400.

The previous prime is 1011055489. The next prime is 1011055537. The reversal of 1011055511 is 1155501101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011055511 is a prime.

It is a super-2 number, since 2×1011055511² = 2044466492646942242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011055561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3858860 + ... + 3859121.

It is an arithmetic number, because the mean of its divisors is an integer number (254693406).

Almost surely, 2^1011055511 is an apocalyptic number.

1011055511 is a deficient number, since it is larger than the sum of its proper divisors (7718113).

1011055511 is an equidigital number, since it uses as much as digits as its factorization.

1011055511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7718112.

The product of its (nonzero) digits is 125, while the sum is 20.

The square root of 1011055511 is about 31797.0990972447. The cubic root of 1011055511 is about 1003.6716726538.

Adding to 1011055511 its reverse (1155501101), we get a palindrome (2166556612).

The spelling of 1011055511 in words is "one billion, eleven million, fifty-five thousand, five hundred eleven".