1081189632 has 144 divisors (see below), whose sum is σ = 2966906880. Its totient is φ = 349403136.

The previous prime is 1081189621. The next prime is 1081189643. The reversal of 1081189632 is 2369811801.

It is an interprime number because it is at equal distance from previous prime (1081189621) and next prime (1081189643).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4848273 + ... + 4848495.

It is an arithmetic number, because the mean of its divisors is an integer number (20603520).

Almost surely, 2^1081189632 is an apocalyptic number.

1081189632 is a gapful number since it is divisible by the number (12) 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 1081189632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1483453440).

1081189632 is an abundant number, since it is smaller than the sum of its proper divisors (1885717248).

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

1081189632 is a wasteful number, since it uses less digits than its factorization.

1081189632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1081189632 is about 32881.4481432920. The cubic root of 1081189632 is about 1026.3621412743.

The spelling of 1081189632 in words is "one billion, eighty-one million, one hundred eighty-nine thousand, six hundred thirty-two".