9720695009 has 4 divisors (see below), whose sum is σ = 9721151940. Its totient is φ = 9720238080.

The previous prime is 9720695003. The next prime is 9720695021. The reversal of 9720695009 is 9005960279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9005960279 = 257 ⋅35042647.

It can be written as a sum of positive squares in 2 ways, for example, as 7391184784 + 2329510225 = 85972^2 + 48265^2 .

It is a cyclic number.

It is not a de Polignac number, because 9720695009 - 2¹⁶ = 9720629473 is a prime.

It is a super-2 number, since 2×9720695009² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9720695003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194912 + ... + 239649.

It is an arithmetic number, because the mean of its divisors is an integer number (2430287985).

Almost surely, 2^9720695009 is an apocalyptic number.

It is an amenable number.

9720695009 is a deficient number, since it is larger than the sum of its proper divisors (456931).

9720695009 is a wasteful number, since it uses less digits than its factorization.

9720695009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456930.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 9720695009 is about 98593.5850296560. The cubic root of 9720695009 is about 2134.1868471784.

The spelling of 9720695009 in words is "nine billion, seven hundred twenty million, six hundred ninety-five thousand, nine".