1139551805 has 16 divisors (see below), whose sum is σ = 1566211584. Its totient is φ = 779708160.

The previous prime is 1139551799. The next prime is 1139551849. The reversal of 1139551805 is 5081559311.

It is not a de Polignac number, because 1139551805 - 2⁶ = 1139551741 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 18956 + ... + 51365.

It is an arithmetic number, because the mean of its divisors is an integer number (97888224).

Almost surely, 2^1139551805 is an apocalyptic number.

It is an amenable number.

1139551805 is a deficient number, since it is larger than the sum of its proper divisors (426659779).

1139551805 is an equidigital number, since it uses as much as digits as its factorization.

1139551805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70796.

The product of its (nonzero) digits is 27000, while the sum is 38.

The square root of 1139551805 is about 33757.2481846492. The cubic root of 1139551805 is about 1044.5070070688.

The spelling of 1139551805 in words is "one billion, one hundred thirty-nine million, five hundred fifty-one thousand, eight hundred five".