9688621997 has 16 divisors (see below), whose sum is σ = 10409963760. Its totient is φ = 8984936448.

The previous prime is 9688621979. The next prime is 9688622003. The reversal of 9688621997 is 7991268869.

9688621997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 743434756 + 8945187241 = 27266^2 + 94579^2 .

It is a cyclic number.

It is not a de Polignac number, because 9688621997 - 2¹² = 9688617901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9688621967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364793 + ... + 390449.

It is an arithmetic number, because the mean of its divisors is an integer number (650622735).

Almost surely, 2^9688621997 is an apocalyptic number.

9688621997 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

9688621997 is a deficient number, since it is larger than the sum of its proper divisors (721341763).

9688621997 is a wasteful number, since it uses less digits than its factorization.

9688621997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26000.

The product of its digits is 23514624, while the sum is 65.

The square root of 9688621997 is about 98430.7980105820. The cubic root of 9688621997 is about 2131.8370419097.

The spelling of 9688621997 in words is "nine billion, six hundred eighty-eight million, six hundred twenty-one thousand, nine hundred ninety-seven".