8491722319 has 4 divisors (see below), whose sum is σ = 8784540360. Its totient is φ = 8198904280.

The previous prime is 8491722311. The next prime is 8491722347. The reversal of 8491722319 is 9132271948.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8491722319 - 2³ = 8491722311 is a prime.

It is a super-2 number, since 2×8491722319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491722311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146408977 + ... + 146409034.

It is an arithmetic number, because the mean of its divisors is an integer number (2196135090).

Almost surely, 2^8491722319 is an apocalyptic number.

8491722319 is a deficient number, since it is larger than the sum of its proper divisors (292818041).

8491722319 is a wasteful number, since it uses less digits than its factorization.

8491722319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292818040.

The product of its digits is 217728, while the sum is 46.

The square root of 8491722319 is about 92150.5416099113. The cubic root of 8491722319 is about 2040.1648526749.

The spelling of 8491722319 in words is "eight billion, four hundred ninety-one million, seven hundred twenty-two thousand, three hundred nineteen".