79281109 has 2 divisors, whose sum is σ = 79281110. Its totient is φ = 79281108.

The previous prime is 79281071. The next prime is 79281113. The reversal of 79281109 is 90118297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70190884 + 9090225 = 8378^2 + 3015^2 .

It is an emirp because it is prime and its reverse (90118297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79281109 - 2²¹ = 77183957 is a prime.

It is equal to p_4629907 and since 79281109 and 4629907 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79281409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39640554 + 39640555.

It is an arithmetic number, because the mean of its divisors is an integer number (39640555).

Almost surely, 2^79281109 is an apocalyptic number.

It is an amenable number.

79281109 is a deficient number, since it is larger than the sum of its proper divisors (1).

79281109 is an equidigital number, since it uses as much as digits as its factorization.

79281109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 79281109 is about 8903.9939914625. The cubic root of 79281109 is about 429.5923827869.

The spelling of 79281109 in words is "seventy-nine million, two hundred eighty-one thousand, one hundred nine".