1161223899 has 32 divisors (see below), whose sum is σ = 1728691200. Its totient is φ = 687411360.

The previous prime is 1161223891. The next prime is 1161223907. The reversal of 1161223899 is 9983221611.

It is an interprime number because it is at equal distance from previous prime (1161223891) and next prime (1161223907).

It is not a de Polignac number, because 1161223899 - 2³ = 1161223891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161223899.

It is not an unprimeable number, because it can be changed into a prime (1161223891) 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, 315532 + ... + 319190.

It is an arithmetic number, because the mean of its divisors is an integer number (54021600).

Almost surely, 2^1161223899 is an apocalyptic number.

1161223899 is a deficient number, since it is larger than the sum of its proper divisors (567467301).

1161223899 is a wasteful number, since it uses less digits than its factorization.

1161223899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895.

The product of its digits is 46656, while the sum is 42.

The square root of 1161223899 is about 34076.7354510376. The cubic root of 1161223899 is about 1051.0869768502.

It can be divided in two parts, 116122 and 3899, that added together give a palindrome (120021).

The spelling of 1161223899 in words is "one billion, one hundred sixty-one million, two hundred twenty-three thousand, eight hundred ninety-nine".