9661979 has 2 divisors, whose sum is σ = 9661980. Its totient is φ = 9661978.

The previous prime is 9661969. The next prime is 9661991. The reversal of 9661979 is 9791669.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9661979 - 2¹⁶ = 9596443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9661919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830989 + 4830990.

It is an arithmetic number, because the mean of its divisors is an integer number (4830990).

Almost surely, 2^9661979 is an apocalyptic number.

9661979 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661979 is an equidigital number, since it uses as much as digits as its factorization.

9661979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 47.

The square root of 9661979 is about 3108.3724036865. The cubic root of 9661979 is about 212.9881116305.

The spelling of 9661979 in words is "nine million, six hundred sixty-one thousand, nine hundred seventy-nine".