9681613 has 2 divisors, whose sum is σ = 9681614. Its totient is φ = 9681612.

The previous prime is 9681611. The next prime is 9681629. The reversal of 9681613 is 3161869.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6985449 + 2696164 = 2643^2 + 1642^2 .

It is a cyclic number.

It is not a de Polignac number, because 9681613 - 2¹ = 9681611 is a prime.

Together with 9681611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9681611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4840806 + 4840807.

It is an arithmetic number, because the mean of its divisors is an integer number (4840807).

Almost surely, 2^9681613 is an apocalyptic number.

It is an amenable number.

9681613 is a deficient number, since it is larger than the sum of its proper divisors (1).

9681613 is an equidigital number, since it uses as much as digits as its factorization.

9681613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 9681613 is about 3111.5290453409. The cubic root of 9681613 is about 213.1322842744.

The spelling of 9681613 in words is "nine million, six hundred eighty-one thousand, six hundred thirteen".