1081661412 has 72 divisors (see below), whose sum is σ = 2868753216. Its totient is φ = 315285696.

The previous prime is 1081661387. The next prime is 1081661423. The reversal of 1081661412 is 2141661801.

It is a self number, because there is not a number n which added to its sum of digits gives 1081661412.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46713 + ... + 65919.

Almost surely, 2^1081661412 is an apocalyptic number.

1081661412 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 1081661412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434376608).

1081661412 is an abundant number, since it is smaller than the sum of its proper divisors (1787091804).

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

1081661412 is a wasteful number, since it uses less digits than its factorization.

1081661412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19265 (or 19244 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1081661412 is about 32888.6213149776. The cubic root of 1081661412 is about 1026.5114048583.

The spelling of 1081661412 in words is "one billion, eighty-one million, six hundred sixty-one thousand, four hundred twelve".