7981289 has 2 divisors, whose sum is σ = 7981290. Its totient is φ = 7981288.

The previous prime is 7981283. The next prime is 7981297. The reversal of 7981289 is 9821897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7333264 + 648025 = 2708^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 7981289 - 2⁸ = 7981033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7981283) 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, 3990644 + 3990645.

It is an arithmetic number, because the mean of its divisors is an integer number (3990645).

Almost surely, 2^7981289 is an apocalyptic number.

It is an amenable number.

7981289 is a deficient number, since it is larger than the sum of its proper divisors (1).

7981289 is an equidigital number, since it uses as much as digits as its factorization.

7981289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 7981289 is about 2825.1175196795. The cubic root of 7981289 is about 199.8439532788.

The spelling of 7981289 in words is "seven million, nine hundred eighty-one thousand, two hundred eighty-nine".