9634907921 has 2 divisors, whose sum is σ = 9634907922. Its totient is φ = 9634907920.

The previous prime is 9634907881. The next prime is 9634907939. The reversal of 9634907921 is 1297094369.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8193870400 + 1441037521 = 90520^2 + 37961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9634907921 is a prime.

It is a super-2 number, since 2×9634907921² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9634907921.

It is not a weakly prime, because it can be changed into another prime (9634907951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4817453960 + 4817453961.

It is an arithmetic number, because the mean of its divisors is an integer number (4817453961).

Almost surely, 2^9634907921 is an apocalyptic number.

It is an amenable number.

9634907921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9634907921 is an equidigital number, since it uses as much as digits as its factorization.

9634907921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 9634907921 is about 98157.5668046025. The cubic root of 9634907921 is about 2127.8900779222.

The spelling of 9634907921 in words is "nine billion, six hundred thirty-four million, nine hundred seven thousand, nine hundred twenty-one".