1161781596 has 24 divisors (see below), whose sum is σ = 3012026640. Its totient is φ = 387260496.

The previous prime is 1161781573. The next prime is 1161781601. The reversal of 1161781596 is 6951871611.

1161781596 is a `hidden beast` number, since 11 + 617 + 8 + 15 + 9 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5378511 + ... + 5378726.

It is an arithmetic number, because the mean of its divisors is an integer number (125501110).

Almost surely, 2^1161781596 is an apocalyptic number.

It is an amenable number.

1161781596 is an abundant number, since it is smaller than the sum of its proper divisors (1850245044).

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

1161781596 is a wasteful number, since it uses less digits than its factorization.

1161781596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10757250 (or 10757242 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 1161781596 is about 34084.9174269207. The cubic root of 1161781596 is about 1051.2552172263.

The spelling of 1161781596 in words is "one billion, one hundred sixty-one million, seven hundred eighty-one thousand, five hundred ninety-six".