1161220944 has 80 divisors (see below), whose sum is σ = 3256236032. Its totient is φ = 354461184.

The previous prime is 1161220943. The next prime is 1161221011. The reversal of 1161220944 is 4490221611.

It is a super-2 number, since 2×1161220944² = 2696868161568502272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161220943) 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, 71922 + ... + 86574.

Almost surely, 2^1161220944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161220944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1628118016).

1161220944 is an abundant number, since it is smaller than the sum of its proper divisors (2095015088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161220944 is a wasteful number, since it uses less digits than its factorization.

1161220944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14804 (or 14798 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1161220944 is about 34076.6920929834. The cubic root of 1161220944 is about 1051.0860852723.

The spelling of 1161220944 in words is "one billion, one hundred sixty-one million, two hundred twenty thousand, nine hundred forty-four".