79861289 has 2 divisors, whose sum is σ = 79861290. Its totient is φ = 79861288.

The previous prime is 79861219. The next prime is 79861303. The reversal of 79861289 is 98216897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76650025 + 3211264 = 8755^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 79861289 - 2¹⁶ = 79795753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79861219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39930644 + 39930645.

It is an arithmetic number, because the mean of its divisors is an integer number (39930645).

Almost surely, 2^79861289 is an apocalyptic number.

It is an amenable number.

79861289 is a deficient number, since it is larger than the sum of its proper divisors (1).

79861289 is an equidigital number, since it uses as much as digits as its factorization.

79861289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 79861289 is about 8936.5143652321. The cubic root of 79861289 is about 430.6377574419.

The spelling of 79861289 in words is "seventy-nine million, eight hundred sixty-one thousand, two hundred eighty-nine".