9621979 has 2 divisors, whose sum is σ = 9621980. Its totient is φ = 9621978.

The previous prime is 9621977. The next prime is 9622001. The reversal of 9621979 is 9791269.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9621979 - 2¹ = 9621977 is a prime.

Together with 9621977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9621971) 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, 4810989 + 4810990.

It is an arithmetic number, because the mean of its divisors is an integer number (4810990).

Almost surely, 2^9621979 is an apocalyptic number.

9621979 is a deficient number, since it is larger than the sum of its proper divisors (1).

9621979 is an equidigital number, since it uses as much as digits as its factorization.

9621979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 9621979 is about 3101.9314950527. The cubic root of 9621979 is about 212.6937858562.

The spelling of 9621979 in words is "nine million, six hundred twenty-one thousand, nine hundred seventy-nine".