9997550281 has 8 divisors (see below), whose sum is σ = 10590137640. Its totient is φ = 9405462528.

The previous prime is 9997550261. The next prime is 9997550293. The reversal of 9997550281 is 1820557999.

9997550281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5546525625 + 4451024656 = 74475^2 + 66716^2 .

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 9997550281 - 2¹⁵ = 9997517513 is a prime.

It is a super-2 number, since 2×9997550281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9997550201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83296 + ... + 164113.

It is an arithmetic number, because the mean of its divisors is an integer number (1323767205).

Almost surely, 2^9997550281 is an apocalyptic number.

It is an amenable number.

9997550281 is a deficient number, since it is larger than the sum of its proper divisors (592587359).

9997550281 is a wasteful number, since it uses less digits than its factorization.

9997550281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249803.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The square root of 9997550281 is about 99987.7506547677. The cubic root of 9997550281 is about 2154.2587503445.

The spelling of 9997550281 in words is "nine billion, nine hundred ninety-seven million, five hundred fifty thousand, two hundred eighty-one".