984172555969 has 4 divisors (see below), whose sum is σ = 984256850644. Its totient is φ = 984088261296.

The previous prime is 984172555957. The next prime is 984172555973. The reversal of 984172555969 is 969555271489.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 969555271489 = 7 ⋅138507895927.

It can be written as a sum of positive squares in 2 ways, for example, as 767866638400 + 216305917569 = 876280^2 + 465087^2 .

It is a cyclic number.

It is not a de Polignac number, because 984172555969 - 2¹¹ = 984172553921 is a prime.

It is a super-2 number, since 2×984172555969² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 984172555898 and 984172555907.

It is not an unprimeable number, because it can be changed into a prime (984172555909) 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, 42129822 + ... + 42153175.

It is an arithmetic number, because the mean of its divisors is an integer number (246064212661).

Almost surely, 2^984172555969 is an apocalyptic number.

It is an amenable number.

984172555969 is a deficient number, since it is larger than the sum of its proper divisors (84294675).

984172555969 is a wasteful number, since it uses less digits than its factorization.

984172555969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84294674.

The product of its digits is 244944000, while the sum is 70.

The spelling of 984172555969 in words is "nine hundred eighty-four billion, one hundred seventy-two million, five hundred fifty-five thousand, nine hundred sixty-nine".