1161511288 has 48 divisors (see below), whose sum is σ = 2576388600. Its totient is φ = 489343680.

The previous prime is 1161511283. The next prime is 1161511361. The reversal of 1161511288 is 8821151611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161511283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1983 + ... + 48238.

Almost surely, 2^1161511288 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 1161511288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288194300).

1161511288 is an abundant number, since it is smaller than the sum of its proper divisors (1414877312).

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

1161511288 is a wasteful number, since it uses less digits than its factorization.

1161511288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50300 (or 50289 counting only the distinct ones).

The product of its digits is 3840, while the sum is 34.

The square root of 1161511288 is about 34080.9519820090. The cubic root of 1161511288 is about 1051.1736801751.

Adding to 1161511288 its reverse (8821151611), we get a palindrome (9982662899).

The spelling of 1161511288 in words is "one billion, one hundred sixty-one million, five hundred eleven thousand, two hundred eighty-eight".