1161213044 has 48 divisors (see below), whose sum is σ = 2178583680. Its totient is φ = 539965440.

The previous prime is 1161213017. The next prime is 1161213047. The reversal of 1161213044 is 4403121611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161213047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1725092 + ... + 1725764.

It is an arithmetic number, because the mean of its divisors is an integer number (45387160).

Almost surely, 2^1161213044 is an apocalyptic number.

It is an amenable number.

1161213044 is a deficient number, since it is larger than the sum of its proper divisors (1017370636).

1161213044 is a wasteful number, since it uses less digits than its factorization.

1161213044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1161213044 is about 34076.5761777794. The cubic root of 1161213044 is about 1051.0837016894.

Adding to 1161213044 its reverse (4403121611), we get a palindrome (5564334655).

The spelling of 1161213044 in words is "one billion, one hundred sixty-one million, two hundred thirteen thousand, forty-four".