9961730641 has 2 divisors, whose sum is σ = 9961730642. Its totient is φ = 9961730640.

The previous prime is 9961730617. The next prime is 9961730651. The reversal of 9961730641 is 1460371699.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9820810000 + 140920641 = 99100^2 + 11871^2 .

It is a cyclic number.

It is not a de Polignac number, because 9961730641 - 2¹⁵ = 9961697873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9961730591 and 9961730600.

It is not a weakly prime, because it can be changed into another prime (9961730651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980865320 + 4980865321.

It is an arithmetic number, because the mean of its divisors is an integer number (4980865321).

Almost surely, 2^9961730641 is an apocalyptic number.

It is an amenable number.

9961730641 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961730641 is an equidigital number, since it uses as much as digits as its factorization.

9961730641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 9961730641 is about 99808.4697858854. The cubic root of 9961730641 is about 2151.6828822237.

The spelling of 9961730641 in words is "nine billion, nine hundred sixty-one million, seven hundred thirty thousand, six hundred forty-one".