10984915981 has 4 divisors (see below), whose sum is σ = 11829909532. Its totient is φ = 10139922432.

The previous prime is 10984915969. The next prime is 10984916039. The reversal of 10984915981 is 18951948901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18951948901 = 98299 ⋅192799.

It can be written as a sum of positive squares in 2 ways, for example, as 2485919881 + 8498996100 = 49859^2 + 92190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10984915981 is a prime.

It is a super-2 number, since 2×10984915981² (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 (10984913981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422496756 + ... + 422496781.

It is an arithmetic number, because the mean of its divisors is an integer number (2957477383).

Almost surely, 2^10984915981 is an apocalyptic number.

It is an amenable number.

10984915981 is a deficient number, since it is larger than the sum of its proper divisors (844993551).

10984915981 is an equidigital number, since it uses as much as digits as its factorization.

10984915981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844993550.

The product of its (nonzero) digits is 933120, while the sum is 55.

The spelling of 10984915981 in words is "ten billion, nine hundred eighty-four million, nine hundred fifteen thousand, nine hundred eighty-one".