981809928469 has 8 divisors (see below), whose sum is σ = 998035770680. Its totient is φ = 965588299200.

The previous prime is 981809928433. The next prime is 981809928487. The reversal of 981809928469 is 964829908189.

It can be written as a sum of positive squares in 4 ways, for example, as 170978115025 + 810831813444 = 413495^2 + 900462^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 981809928469 - 2¹¹ = 981809926421 is a prime.

It is a super-2 number, since 2×981809928469² (a number of 25 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 (981809926469) 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 7 ways as a sum of consecutive naturals, for example, 581562 + ... + 1517179.

It is an arithmetic number, because the mean of its divisors is an integer number (124754471335).

Almost surely, 2^981809928469 is an apocalyptic number.

It is an amenable number.

981809928469 is a deficient number, since it is larger than the sum of its proper divisors (16225842211).

981809928469 is a wasteful number, since it uses less digits than its factorization.

981809928469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106471.

The product of its (nonzero) digits is 161243136, while the sum is 73.

The spelling of 981809928469 in words is "nine hundred eighty-one billion, eight hundred nine million, nine hundred twenty-eight thousand, four hundred sixty-nine".