1161013320 has 192 divisors, whose sum is σ = 3959280000. Its totient is φ = 294497280.

The previous prime is 1161013291. The next prime is 1161013327. The reversal of 1161013320 is 233101611.

1161013320 is a `hidden beast` number, since 1 + 1 + 610 + 1 + 33 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1161013293 and 1161013302.

It is not an unprimeable number, because it can be changed into a prime (1161013327) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2326431 + ... + 2326929.

It is an arithmetic number, because the mean of its divisors is an integer number (20621250).

Almost surely, 2^1161013320 is an apocalyptic number.

1161013320 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 1161013320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1979640000).

1161013320 is an abundant number, since it is smaller than the sum of its proper divisors (2798266680).

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

1161013320 is a wasteful number, since it uses less digits than its factorization.

1161013320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1161013320 is about 34073.6455343422. The cubic root of 1161013320 is about 1051.0234375031.

Adding to 1161013320 its reverse (233101611), we get a palindrome (1394114931).

The spelling of 1161013320 in words is "one billion, one hundred sixty-one million, thirteen thousand, three hundred twenty".