1156001005 has 16 divisors (see below), whose sum is σ = 1436143104. Its totient is φ = 892347840.

The previous prime is 1156000997. The next prime is 1156001023. The reversal of 1156001005 is 5001006511.

It is not a de Polignac number, because 1156001005 - 2³ = 1156000997 is a prime.

It is a super-2 number, since 2×1156001005² = 2672676647122020050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 43039 + ... + 64531.

It is an arithmetic number, because the mean of its divisors is an integer number (89758944).

Almost surely, 2^1156001005 is an apocalyptic number.

It is an amenable number.

1156001005 is a deficient number, since it is larger than the sum of its proper divisors (280142099).

1156001005 is a wasteful number, since it uses less digits than its factorization.

1156001005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21876.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1156001005 is about 34000.0147794086. The cubic root of 1156001005 is about 1049.5087664371.

Adding to 1156001005 its reverse (5001006511), we get a palindrome (6157007516).

The spelling of 1156001005 in words is "one billion, one hundred fifty-six million, one thousand, five".