10981978927 has 4 divisors (see below), whose sum is σ = 10985263416. Its totient is φ = 10978694440.

The previous prime is 10981978907. The next prime is 10981978939. The reversal of 10981978927 is 72987918901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10981978927 - 2¹⁹ = 10981454639 is a prime.

It is a super-2 number, since 2×10981978927² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10981978907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637224 + ... + 1643917.

It is an arithmetic number, because the mean of its divisors is an integer number (2746315854).

Almost surely, 2^10981978927 is an apocalyptic number.

10981978927 is a deficient number, since it is larger than the sum of its proper divisors (3284489).

10981978927 is an equidigital number, since it uses as much as digits as its factorization.

10981978927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3284488.

The product of its (nonzero) digits is 4572288, while the sum is 61.

The spelling of 10981978927 in words is "ten billion, nine hundred eighty-one million, nine hundred seventy-eight thousand, nine hundred twenty-seven".