1081691438939 has 32 divisors (see below), whose sum is σ = 1132341534720. Its totient is φ = 1032030824832.

The previous prime is 1081691438929. The next prime is 1081691438951. The reversal of 1081691438939 is 9398341961801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081691438939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081691438909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 593356982 + ... + 593358804.

It is an arithmetic number, because the mean of its divisors is an integer number (35385672960).

Almost surely, 2^{1081691438939} is an apocalyptic number.

1081691438939 is a deficient number, since it is larger than the sum of its proper divisors (50650095781).

1081691438939 is a wasteful number, since it uses less digits than its factorization.

1081691438939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699.

The product of its (nonzero) digits is 10077696, while the sum is 62.

The spelling of 1081691438939 in words is "one trillion, eighty-one billion, six hundred ninety-one million, four hundred thirty-eight thousand, nine hundred thirty-nine".