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9938872561 = 42412343521
BaseRepresentation
bin10010100000110011…
…10010100011110001
3221122122202001001011
421100121302203301
5130323322410221
64322120310521
7501203010562
oct112031624361
927578661034
109938872561
114240264072
121b14612441
13c251372a7
146a3db0169
153d28361e1
hex2506728f1

9938872561 has 4 divisors (see below), whose sum is σ = 9941220324. Its totient is φ = 9936524800.

The previous prime is 9938872529. The next prime is 9938872577. The reversal of 9938872561 is 1652788399.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7375374400 + 2563498161 = 85880^2 + 50631^2 .

It is a cyclic number.

It is not a de Polignac number, because 9938872561 - 25 = 9938872529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9938872496 and 9938872505.

It is not an unprimeable number, because it can be changed into a prime (9938872501) 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, 1167520 + ... + 1176001.

It is an arithmetic number, because the mean of its divisors is an integer number (2485305081).

Almost surely, 29938872561 is an apocalyptic number.

It is an amenable number.

9938872561 is a deficient number, since it is larger than the sum of its proper divisors (2347763).

9938872561 is a wasteful number, since it uses less digits than its factorization.

9938872561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347762.

The product of its digits is 6531840, while the sum is 58.

The square root of 9938872561 is about 99693.8943015067. The cubic root of 9938872561 is about 2150.0358790479.

The spelling of 9938872561 in words is "nine billion, nine hundred thirty-eight million, eight hundred seventy-two thousand, five hundred sixty-one".

Divisors: 1 4241 2343521 9938872561