1081185564 has 48 divisors (see below), whose sum is σ = 2644201728. Its totient is φ = 343187328.

The previous prime is 1081185563. The next prime is 1081185577. The reversal of 1081185564 is 4655811801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081185563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54024 + ... + 71280.

It is an arithmetic number, because the mean of its divisors is an integer number (55087536).

Almost surely, 2^1081185564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1081185564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1322100864).

1081185564 is an abundant number, since it is smaller than the sum of its proper divisors (1563016164).

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

1081185564 is a wasteful number, since it uses less digits than its factorization.

1081185564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17514 (or 17512 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 1081185564 is about 32881.3862846444. The cubic root of 1081185564 is about 1026.3608540359.

The spelling of 1081185564 in words is "one billion, eighty-one million, one hundred eighty-five thousand, five hundred sixty-four".