1156561105 has 8 divisors (see below), whose sum is σ = 1586140992. Its totient is φ = 793070448.

The previous prime is 1156561097. The next prime is 1156561117. The reversal of 1156561105 is 5011656511.

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

It is a cyclic number.

It is not a de Polignac number, because 1156561105 - 2³ = 1156561097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16522267 + ... + 16522336.

It is an arithmetic number, because the mean of its divisors is an integer number (198267624).

Almost surely, 2^1156561105 is an apocalyptic number.

It is an amenable number.

1156561105 is a deficient number, since it is larger than the sum of its proper divisors (429579887).

1156561105 is an equidigital number, since it uses as much as digits as its factorization.

1156561105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33044615.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 1156561105 is about 34008.2505430668. The cubic root of 1156561105 is about 1049.6782400349.

The spelling of 1156561105 in words is "one billion, one hundred fifty-six million, five hundred sixty-one thousand, one hundred five".