9926509081 has 4 divisors (see below), whose sum is σ = 9934693732. Its totient is φ = 9918324432.

The previous prime is 9926509067. The next prime is 9926509097. The reversal of 9926509081 is 1809056299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1809056299 = 2767 ⋅653797.

It can be written as a sum of positive squares in 2 ways, for example, as 186595600 + 9739913481 = 13660^2 + 98691^2 .

It is a cyclic number.

It is not a de Polignac number, because 9926509081 - 2⁷ = 9926508953 is a prime.

It is a super-2 number, since 2×9926509081² (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 (9926509781) 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, 4090506 + ... + 4092931.

It is an arithmetic number, because the mean of its divisors is an integer number (2483673433).

Almost surely, 2^9926509081 is an apocalyptic number.

It is an amenable number.

9926509081 is a deficient number, since it is larger than the sum of its proper divisors (8184651).

9926509081 is a wasteful number, since it uses less digits than its factorization.

9926509081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8184650.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 9926509081 is about 99631.8677984108. The cubic root of 9926509081 is about 2149.1439953437.

The spelling of 9926509081 in words is "nine billion, nine hundred twenty-six million, five hundred nine thousand, eighty-one".