9720570491 has 4 divisors (see below), whose sum is σ = 9721459584. Its totient is φ = 9719681400.

The previous prime is 9720570473. The next prime is 9720570529. The reversal of 9720570491 is 1940750279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1940750279 = 13 ⋅149288483.

It is a cyclic number.

It is not a de Polignac number, because 9720570491 - 2²⁶ = 9653461627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9720570421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427940 + ... + 450081.

It is an arithmetic number, because the mean of its divisors is an integer number (2430364896).

Almost surely, 2^9720570491 is an apocalyptic number.

9720570491 is a deficient number, since it is larger than the sum of its proper divisors (889093).

9720570491 is a wasteful number, since it uses less digits than its factorization.

9720570491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889092.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 9720570491 is about 98592.9535565296. The cubic root of 9720570491 is about 2134.1777344619.

The spelling of 9720570491 in words is "nine billion, seven hundred twenty million, five hundred seventy thousand, four hundred ninety-one".