7979009 has 2 divisors, whose sum is σ = 7979010. Its totient is φ = 7979008.

The previous prime is 7978981. The next prime is 7979021. The reversal of 7979009 is 9009797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7756225 + 222784 = 2785^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 7979009 - 2⁸ = 7978753 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7972009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989504 + 3989505.

It is an arithmetic number, because the mean of its divisors is an integer number (3989505).

It is a Proth number, since it is equal to 487 ⋅ 2¹⁴ + 1 and 487 < 2¹⁴.

Almost surely, 2^7979009 is an apocalyptic number.

It is an amenable number.

7979009 is a deficient number, since it is larger than the sum of its proper divisors (1).

7979009 is an equidigital number, since it uses as much as digits as its factorization.

7979009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35721, while the sum is 41.

The square root of 7979009 is about 2824.7139678205. The cubic root of 7979009 is about 199.8249217828.

The spelling of 7979009 in words is "seven million, nine hundred seventy-nine thousand, nine".