9979091 has 2 divisors, whose sum is σ = 9979092. Its totient is φ = 9979090.

The previous prime is 9979061. The next prime is 9979111. The reversal of 9979091 is 1909799.

It is a strong prime.

It is an emirp because it is prime and its reverse (1909799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9979091 - 2¹⁸ = 9716947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9979061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989545 + 4989546.

It is an arithmetic number, because the mean of its divisors is an integer number (4989546).

Almost surely, 2^9979091 is an apocalyptic number.

9979091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9979091 is an equidigital number, since it uses as much as digits as its factorization.

9979091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 9979091 is about 3158.9699270490. The cubic root of 9979091 is about 215.2932073106.

The spelling of 9979091 in words is "nine million, nine hundred seventy-nine thousand, ninety-one".