1161255216 has 80 divisors (see below), whose sum is σ = 3277290240. Its totient is φ = 351394560.

The previous prime is 1161255203. The next prime is 1161255217. The reversal of 1161255216 is 6125521611.

It is not an unprimeable number, because it can be changed into a prime (1161255217) 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, 560230 + ... + 562298.

It is an arithmetic number, because the mean of its divisors is an integer number (40966128).

Almost surely, 2^1161255216 is an apocalyptic number.

1161255216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161255216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1638645120).

1161255216 is an abundant number, since it is smaller than the sum of its proper divisors (2116035024).

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

1161255216 is a wasteful number, since it uses less digits than its factorization.

1161255216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154 (or 3148 counting only the distinct ones).

The product of its digits is 3600, while the sum is 30.

The square root of 1161255216 is about 34077.1949549842. The cubic root of 1161255216 is about 1051.0964256725.

Adding to 1161255216 its reverse (6125521611), we get a palindrome (7286776827).

The spelling of 1161255216 in words is "one billion, one hundred sixty-one million, two hundred fifty-five thousand, two hundred sixteen".