9721717058 has 4 divisors (see below), whose sum is σ = 14582575590. Its totient is φ = 4860858528.

The previous prime is 9721717051. The next prime is 9721717097. The reversal of 9721717058 is 8507171279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8507171279 = 8599 ⋅989321.

It can be written as a sum of positive squares in only one way, i.e., 9703629049 + 18088009 = 98507^2 + 4253^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9721717051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2430429263 + ... + 2430429266.

Almost surely, 2^9721717058 is an apocalyptic number.

9721717058 is a deficient number, since it is larger than the sum of its proper divisors (4860858532).

9721717058 is a wasteful number, since it uses less digits than its factorization.

9721717058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860858531.

The product of its (nonzero) digits is 246960, while the sum is 47.

The square root of 9721717058 is about 98598.7680348999. The cubic root of 9721717058 is about 2134.2616417992.

The spelling of 9721717058 in words is "nine billion, seven hundred twenty-one million, seven hundred seventeen thousand, fifty-eight".