981853089581 has 64 divisors (see below), whose sum is σ = 1393306790400. Its totient is φ = 668786098176.

The previous prime is 981853089557. The next prime is 981853089611. The reversal of 981853089581 is 185980358189.

It is not a de Polignac number, because 981853089581 - 2¹⁴ = 981853073197 is a prime.

It is a super-2 number, since 2×981853089581² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981853089521) 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 63 ways as a sum of consecutive naturals, for example, 276461 + ... + 1428333.

It is an arithmetic number, because the mean of its divisors is an integer number (21770418600).

Almost surely, 2^981853089581 is an apocalyptic number.

981853089581 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

981853089581 is a deficient number, since it is larger than the sum of its proper divisors (411453700819).

981853089581 is a wasteful number, since it uses less digits than its factorization.

981853089581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151958.

The product of its (nonzero) digits is 24883200, while the sum is 65.

The spelling of 981853089581 in words is "nine hundred eighty-one billion, eight hundred fifty-three million, eighty-nine thousand, five hundred eighty-one".