9620909621 has 2 divisors, whose sum is σ = 9620909622. Its totient is φ = 9620909620.

The previous prime is 9620909593. The next prime is 9620909633. The reversal of 9620909621 is 1269090269.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9620863396 + 46225 = 98086^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 9620909621 - 2¹⁰ = 9620908597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9620909651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4810454810 + 4810454811.

It is an arithmetic number, because the mean of its divisors is an integer number (4810454811).

Almost surely, 2^9620909621 is an apocalyptic number.

It is an amenable number.

9620909621 is a deficient number, since it is larger than the sum of its proper divisors (1).

9620909621 is an equidigital number, since it uses as much as digits as its factorization.

9620909621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 9620909621 is about 98086.2356347719. The cubic root of 9620909621 is about 2126.8590602560.

Multiplying 9620909621 by its sum of digits (44), we get a palindrome (423320023324).

The spelling of 9620909621 in words is "nine billion, six hundred twenty million, nine hundred nine thousand, six hundred twenty-one".