1156605005 has 4 divisors (see below), whose sum is σ = 1387926012. Its totient is φ = 925284000.

The previous prime is 1156604971. The next prime is 1156605007. The reversal of 1156605005 is 5005066511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5005066511 = 16349 ⋅306139.

It can be written as a sum of positive squares in 2 ways, for example, as 861246409 + 295358596 = 29347^2 + 17186^2 .

It is not a de Polignac number, because 1156605005 - 2¹² = 1156600909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156605007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115660496 + ... + 115660505.

It is an arithmetic number, because the mean of its divisors is an integer number (346981503).

Almost surely, 2^1156605005 is an apocalyptic number.

It is an amenable number.

1156605005 is a deficient number, since it is larger than the sum of its proper divisors (231321007).

1156605005 is an equidigital number, since it uses as much as digits as its factorization.

1156605005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231321006.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1156605005 is about 34008.8959685551. The cubic root of 1156605005 is about 1049.6915208699.

The spelling of 1156605005 in words is "one billion, one hundred fifty-six million, six hundred five thousand, five".