9920579 has 2 divisors, whose sum is σ = 9920580. Its totient is φ = 9920578.

The previous prime is 9920557. The next prime is 9920597. The reversal of 9920579 is 9750299.

Together with next prime (9920597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9920579 is a prime.

It is not a weakly prime, because it can be changed into another prime (9920539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960289 + 4960290.

It is an arithmetic number, because the mean of its divisors is an integer number (4960290).

Almost surely, 2^9920579 is an apocalyptic number.

9920579 is a deficient number, since it is larger than the sum of its proper divisors (1).

9920579 is an equidigital number, since it uses as much as digits as its factorization.

9920579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 9920579 is about 3149.6950646055. The cubic root of 9920579 is about 214.8715945006.

The spelling of 9920579 in words is "nine million, nine hundred twenty thousand, five hundred seventy-nine".