8491409291 has 8 divisors (see below), whose sum is σ = 8635029168. Its totient is φ = 8347932000.

The previous prime is 8491409279. The next prime is 8491409309. The reversal of 8491409291 is 1929041948.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8491409291 is a prime.

It is a super-2 number, since 2×8491409291² (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 (8491409231) 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, 88061 + ... + 157281.

It is an arithmetic number, because the mean of its divisors is an integer number (1079378646).

Almost surely, 2^8491409291 is an apocalyptic number.

8491409291 is a deficient number, since it is larger than the sum of its proper divisors (143619877).

8491409291 is a wasteful number, since it uses less digits than its factorization.

8491409291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71293.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 8491409291 is about 92148.8431343552. The cubic root of 8491409291 is about 2040.1397836902.

The spelling of 8491409291 in words is "eight billion, four hundred ninety-one million, four hundred nine thousand, two hundred ninety-one".