1161421056 has 216 divisors, whose sum is σ = 3612729120. Its totient is φ = 357654528.

The previous prime is 1161421043. The next prime is 1161421067. The reversal of 1161421056 is 6501241611.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1882060 + ... + 1882676.

Almost surely, 2^1161421056 is an apocalyptic number.

1161421056 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 1161421056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1806364560).

1161421056 is an abundant number, since it is smaller than the sum of its proper divisors (2451308064).

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

1161421056 is a wasteful number, since it uses less digits than its factorization.

1161421056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1161421056 is about 34079.6281669856. The cubic root of 1161421056 is about 1051.1464593290.

Adding to 1161421056 its reverse (6501241611), we get a palindrome (7662662667).

The spelling of 1161421056 in words is "one billion, one hundred sixty-one million, four hundred twenty-one thousand, fifty-six".