9905539491 has 24 divisors (see below), whose sum is σ = 15059413824. Its totient is φ = 6505119720.

The previous prime is 9905539487. The next prime is 9905539493. The reversal of 9905539491 is 1949355099.

It is not a de Polignac number, because 9905539491 - 2² = 9905539487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9905539493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 287925 + ... + 320486.

It is an arithmetic number, because the mean of its divisors is an integer number (627475576).

Almost surely, 2^9905539491 is an apocalyptic number.

9905539491 is a deficient number, since it is larger than the sum of its proper divisors (5153874333).

9905539491 is an equidigital number, since it uses as much as digits as its factorization.

9905539491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608493 (or 608481 counting only the distinct ones).

The product of its (nonzero) digits is 1968300, while the sum is 54.

The square root of 9905539491 is about 99526.5768074036. The cubic root of 9905539491 is about 2147.6295844679.

The spelling of 9905539491 in words is "nine billion, nine hundred five million, five hundred thirty-nine thousand, four hundred ninety-one".