79109171 has 2 divisors, whose sum is σ = 79109172. Its totient is φ = 79109170.

The previous prime is 79109119. The next prime is 79109183. The reversal of 79109171 is 17190197.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17190197) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79109171 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (79109671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39554585 + 39554586.

It is an arithmetic number, because the mean of its divisors is an integer number (39554586).

Almost surely, 2^79109171 is an apocalyptic number.

79109171 is a deficient number, since it is larger than the sum of its proper divisors (1).

79109171 is an equidigital number, since it uses as much as digits as its factorization.

79109171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969, while the sum is 35.

The square root of 79109171 is about 8894.3336456420. Note that the first 3 decimals coincide. The cubic root of 79109171 is about 429.2816037689.

The spelling of 79109171 in words is "seventy-nine million, one hundred nine thousand, one hundred seventy-one".