9168910491 has 16 divisors (see below), whose sum is σ = 13212152576. Its totient is φ = 5622461856.

The previous prime is 9168910489. The next prime is 9168910493. The reversal of 9168910491 is 1940198619.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9168910489) and next prime (9168910493).

It is not a de Polignac number, because 9168910491 - 2¹ = 9168910489 is a prime.

It is a super-2 number, since 2×9168910491² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9168910491.

It is not an unprimeable number, because it can be changed into a prime (9168910493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404335 + ... + 426408.

It is an arithmetic number, because the mean of its divisors is an integer number (825759536).

Almost surely, 2^9168910491 is an apocalyptic number.

9168910491 is a deficient number, since it is larger than the sum of its proper divisors (4043242085).

9168910491 is a wasteful number, since it uses less digits than its factorization.

9168910491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831042.

The product of its (nonzero) digits is 139968, while the sum is 48.

The square root of 9168910491 is about 95754.4280490464. The cubic root of 9168910491 is about 2093.0161416238.

The spelling of 9168910491 in words is "nine billion, one hundred sixty-eight million, nine hundred ten thousand, four hundred ninety-one".