1127211805 has 4 divisors (see below), whose sum is σ = 1352654172. Its totient is φ = 901769440.

The previous prime is 1127211779. The next prime is 1127211851. The reversal of 1127211805 is 5081127211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 543216249 + 583995556 = 23307^2 + 24166^2 .

It is not a de Polignac number, because 1127211805 - 2²⁹ = 590340893 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 112721176 + ... + 112721185.

It is an arithmetic number, because the mean of its divisors is an integer number (338163543).

Almost surely, 2^1127211805 is an apocalyptic number.

It is an amenable number.

1127211805 is a deficient number, since it is larger than the sum of its proper divisors (225442367).

1127211805 is an equidigital number, since it uses as much as digits as its factorization.

1127211805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225442366.

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 1127211805 is about 33573.9751146628. The cubic root of 1127211805 is about 1040.7230564143.

The spelling of 1127211805 in words is "one billion, one hundred twenty-seven million, two hundred eleven thousand, eight hundred five".