79421911 has 2 divisors, whose sum is σ = 79421912. Its totient is φ = 79421910.

The previous prime is 79421887. The next prime is 79421933. The reversal of 79421911 is 11912497.

It is a strong prime.

It is an emirp because it is prime and its reverse (11912497) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79421911 - 2¹⁵ = 79389143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79421941) 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, 39710955 + 39710956.

It is an arithmetic number, because the mean of its divisors is an integer number (39710956).

Almost surely, 2^79421911 is an apocalyptic number.

79421911 is a deficient number, since it is larger than the sum of its proper divisors (1).

79421911 is an equidigital number, since it uses as much as digits as its factorization.

79421911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 34.

The square root of 79421911 is about 8911.8971605377. The cubic root of 79421911 is about 429.8465488149.

The spelling of 79421911 in words is "seventy-nine million, four hundred twenty-one thousand, nine hundred eleven".