1161221160 has 64 divisors (see below), whose sum is σ = 3800364480. Its totient is φ = 281507840.

The previous prime is 1161221123. The next prime is 1161221167. The reversal of 1161221160 is 611221611.

It is not an unprimeable number, because it can be changed into a prime (1161221167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438537 + ... + 441176.

It is an arithmetic number, because the mean of its divisors is an integer number (59380695).

Almost surely, 2^1161221160 is an apocalyptic number.

1161221160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161221160 is an abundant number, since it is smaller than the sum of its proper divisors (2639143320).

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

1161221160 is a wasteful number, since it uses less digits than its factorization.

1161221160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879738 (or 879734 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1161221160 is about 34076.6952623050. The cubic root of 1161221160 is about 1051.0861504435.

Adding to 1161221160 its reverse (611221611), we get a palindrome (1772442771).

The spelling of 1161221160 in words is "one billion, one hundred sixty-one million, two hundred twenty-one thousand, one hundred sixty".