1055551111 has 4 divisors (see below), whose sum is σ = 1058265000. Its totient is φ = 1052837224.

The previous prime is 1055551093. The next prime is 1055551139. The reversal of 1055551111 is 1111555501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111555501 = 7 ⋅158793643.

It is a cyclic number.

It is not a de Polignac number, because 1055551111 - 2⁹ = 1055550599 is a prime.

It is a super-2 number, since 2×1055551111² = 2228376295866668642, 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 (1055551141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1356361 + ... + 1357138.

It is an arithmetic number, because the mean of its divisors is an integer number (264566250).

Almost surely, 2^1055551111 is an apocalyptic number.

1055551111 is a deficient number, since it is larger than the sum of its proper divisors (2713889).

1055551111 is an equidigital number, since it uses as much as digits as its factorization.

1055551111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713888.

The product of its (nonzero) digits is 625, while the sum is 25.

The square root of 1055551111 is about 32489.2460823578. The cubic root of 1055551111 is about 1018.1843616445.

The spelling of 1055551111 in words is "one billion, fifty-five million, five hundred fifty-one thousand, one hundred eleven".