9961613 has 2 divisors, whose sum is σ = 9961614. Its totient is φ = 9961612.

The previous prime is 9961607. The next prime is 9961631. The reversal of 9961613 is 3161699.

Together with next prime (9961631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9815689 + 145924 = 3133^2 + 382^2 .

9961613 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 9961613 - 2¹⁶ = 9896077 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9961673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980806 + 4980807.

It is an arithmetic number, because the mean of its divisors is an integer number (4980807).

Almost surely, 2^9961613 is an apocalyptic number.

It is an amenable number.

9961613 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961613 is an equidigital number, since it uses as much as digits as its factorization.

9961613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 35.

The square root of 9961613 is about 3156.2023065704. The cubic root of 9961613 is about 215.1674412239.

The spelling of 9961613 in words is "nine million, nine hundred sixty-one thousand, six hundred thirteen".