79171321 has 2 divisors, whose sum is σ = 79171322. Its totient is φ = 79171320.

The previous prime is 79171283. The next prime is 79171327. The reversal of 79171321 is 12317197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77633721 + 1537600 = 8811^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 79171321 - 2²¹ = 77074169 is a prime.

It is not a weakly prime, because it can be changed into another prime (79171327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39585660 + 39585661.

It is an arithmetic number, because the mean of its divisors is an integer number (39585661).

Almost surely, 2^79171321 is an apocalyptic number.

It is an amenable number.

79171321 is a deficient number, since it is larger than the sum of its proper divisors (1).

79171321 is an equidigital number, since it uses as much as digits as its factorization.

79171321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 31.

The square root of 79171321 is about 8897.8267571357. The cubic root of 79171321 is about 429.3939922047.

The spelling of 79171321 in words is "seventy-nine million, one hundred seventy-one thousand, three hundred twenty-one".