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9721697049 = 321606367247
BaseRepresentation
bin10010000110111010…
…10101001100011001
3221002112002101020200
421003131111030121
5124402223301144
64244401412413
7462625030041
oct110335251431
927075071220
109721697049
11413970a979
121a7393a109
13bbc14837c
146831da721
153bd737c69
hex243755319

9721697049 has 12 divisors (see below), whose sum is σ = 14043534336. Its totient is φ = 6480631512.

The previous prime is 9721697047. The next prime is 9721697059. The reversal of 9721697049 is 9407961279.

It is not a de Polignac number, because 9721697049 - 21 = 9721697047 is a prime.

It is a super-2 number, since 2×97216970492 (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9721696986 and 9721697004.

It is not an unprimeable number, because it can be changed into a prime (9721697047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110944 + ... + 178190.

It is an arithmetic number, because the mean of its divisors is an integer number (1170294528).

Almost surely, 29721697049 is an apocalyptic number.

It is an amenable number.

9721697049 is a deficient number, since it is larger than the sum of its proper divisors (4321837287).

9721697049 is a wasteful number, since it uses less digits than its factorization.

9721697049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83316 (or 83313 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The square root of 9721697049 is about 98598.6665680627. Note that the first 3 decimals coincide. The cubic root of 9721697049 is about 2134.2601775698.

The spelling of 9721697049 in words is "nine billion, seven hundred twenty-one million, six hundred ninety-seven thousand, forty-nine".

Divisors: 1 3 9 16063 48189 67247 144567 201741 605223 1080188561 3240565683 9721697049