1105555561 has 8 divisors (see below), whose sum is σ = 1206301248. Its totient is φ = 1004850000.

The previous prime is 1105555541. The next prime is 1105555589. The reversal of 1105555561 is 1655555011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1105555561 - 2²⁷ = 971337833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1105555541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103836 + ... + 113986.

It is an arithmetic number, because the mean of its divisors is an integer number (150787656).

Almost surely, 2^1105555561 is an apocalyptic number.

1105555561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1105555561 is a deficient number, since it is larger than the sum of its proper divisors (100745687).

1105555561 is a wasteful number, since it uses less digits than its factorization.

1105555561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20063.

The product of its (nonzero) digits is 18750, while the sum is 34.

The square root of 1105555561 is about 33249.8956539716. The cubic root of 1105555561 is about 1034.0150449819.

The spelling of 1105555561 in words is "one billion, one hundred five million, five hundred fifty-five thousand, five hundred sixty-one".