7969721491 has 8 divisors (see below), whose sum is σ = 8275945104. Its totient is φ = 7668823680.

The previous prime is 7969721471. The next prime is 7969721519. The reversal of 7969721491 is 1941279697.

7969721491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 7969721491 - 2¹³ = 7969713299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7969721411) 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, 1328401 + ... + 1334386.

It is an arithmetic number, because the mean of its divisors is an integer number (1034493138).

Almost surely, 2^7969721491 is an apocalyptic number.

7969721491 is a deficient number, since it is larger than the sum of its proper divisors (306223613).

7969721491 is a wasteful number, since it uses less digits than its factorization.

7969721491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662901.

The product of its digits is 1714608, while the sum is 55.

The square root of 7969721491 is about 89273.2966289472. The cubic root of 7969721491 is about 1997.4736009143.

The spelling of 7969721491 in words is "seven billion, nine hundred sixty-nine million, seven hundred twenty-one thousand, four hundred ninety-one".