1161263805 has 32 divisors (see below), whose sum is σ = 2047495296. Its totient is φ = 558399744.

The previous prime is 1161263801. The next prime is 1161263821. The reversal of 1161263805 is 5083621611.

It is not a de Polignac number, because 1161263805 - 2² = 1161263801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161263801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60862 + ... + 77631.

It is an arithmetic number, because the mean of its divisors is an integer number (63984228).

Almost surely, 2^1161263805 is an apocalyptic number.

1161263805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161263805 is a deficient number, since it is larger than the sum of its proper divisors (886231491).

1161263805 is a wasteful number, since it uses less digits than its factorization.

1161263805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138557.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1161263805 is about 34077.3209774477. The cubic root of 1161263805 is about 1051.0990170767.

The spelling of 1161263805 in words is "one billion, one hundred sixty-one million, two hundred sixty-three thousand, eight hundred five".