981891872611 has 8 divisors (see below), whose sum is σ = 1075344424560. Its totient is φ = 890999664672.

The previous prime is 981891872579. The next prime is 981891872617. The reversal of 981891872611 is 116278198189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 981891872611 - 2⁵ = 981891872579 is a prime.

It is a super-2 number, since 2×981891872611² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981891872611.

It is not an unprimeable number, because it can be changed into a prime (981891872617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640085200 + ... + 640086733.

It is an arithmetic number, because the mean of its divisors is an integer number (134418053070).

Almost surely, 2^981891872611 is an apocalyptic number.

981891872611 is a deficient number, since it is larger than the sum of its proper divisors (93452551949).

981891872611 is a wasteful number, since it uses less digits than its factorization.

981891872611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280172005.

The product of its digits is 3483648, while the sum is 61.

The spelling of 981891872611 in words is "nine hundred eighty-one billion, eight hundred ninety-one million, eight hundred seventy-two thousand, six hundred eleven".