1156513280 has 320 divisors, whose sum is σ = 3299788800. Its totient is φ = 384860160.

The previous prime is 1156513279. The next prime is 1156513289. The reversal of 1156513280 is 823156511.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156513289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19601891 + ... + 19601949.

It is an arithmetic number, because the mean of its divisors is an integer number (10311840).

Almost surely, 2^1156513280 is an apocalyptic number.

1156513280 is a gapful number since it is divisible by the number (10) 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 1156513280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1649894400).

1156513280 is an abundant number, since it is smaller than the sum of its proper divisors (2143275520).

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

1156513280 is a wasteful number, since it uses less digits than its factorization.

1156513280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 1156513280 is about 34007.5473975998. The cubic root of 1156513280 is about 1049.6637714079.

Adding to 1156513280 its reverse (823156511), we get a palindrome (1979669791).

The spelling of 1156513280 in words is "one billion, one hundred fifty-six million, five hundred thirteen thousand, two hundred eighty".