1081193812 has 12 divisors (see below), whose sum is σ = 2003388660. Its totient is φ = 508797056.

The previous prime is 1081193809. The next prime is 1081193837. The reversal of 1081193812 is 2183911801.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 615238416 + 465955396 = 24804^2 + 21586^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7949887 + ... + 7950022.

It is an arithmetic number, because the mean of its divisors is an integer number (166949055).

Almost surely, 2^1081193812 is an apocalyptic number.

It is an amenable number.

1081193812 is a deficient number, since it is larger than the sum of its proper divisors (922194848).

1081193812 is a wasteful number, since it uses less digits than its factorization.

1081193812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15899930 (or 15899928 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 1081193812 is about 32881.5117049080. The cubic root of 1081193812 is about 1026.3634639495.

The spelling of 1081193812 in words is "one billion, eighty-one million, one hundred ninety-three thousand, eight hundred twelve".