79171409 has 2 divisors, whose sum is σ = 79171410. Its totient is φ = 79171408.

The previous prime is 79171399. The next prime is 79171429. The reversal of 79171409 is 90417197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78411025 + 760384 = 8855^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 79171409 - 2²⁰ = 78122833 is a prime.

It is a super-2 number, since 2×79171409² = 12536224006090562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79171429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39585704 + 39585705.

It is an arithmetic number, because the mean of its divisors is an integer number (39585705).

Almost surely, 2^79171409 is an apocalyptic number.

It is an amenable number.

79171409 is a deficient number, since it is larger than the sum of its proper divisors (1).

79171409 is an equidigital number, since it uses as much as digits as its factorization.

79171409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 79171409 is about 8897.8317021620. The cubic root of 79171409 is about 429.3941512970.

The spelling of 79171409 in words is "seventy-nine million, one hundred seventy-one thousand, four hundred nine".