79970729 has 2 divisors, whose sum is σ = 79970730. Its totient is φ = 79970728.

The previous prime is 79970707. The next prime is 79970743. The reversal of 79970729 is 92707997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 13987600 = 8123^2 + 3740^2 .

It is an emirp because it is prime and its reverse (92707997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79970729 - 2¹⁶ = 79905193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (79970029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39985364 + 39985365.

It is an arithmetic number, because the mean of its divisors is an integer number (39985365).

Almost surely, 2^79970729 is an apocalyptic number.

It is an amenable number.

79970729 is a deficient number, since it is larger than the sum of its proper divisors (1).

79970729 is an equidigital number, since it uses as much as digits as its factorization.

79970729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500094, while the sum is 50.

The square root of 79970729 is about 8942.6354616522. The cubic root of 79970729 is about 430.8343795475.

The spelling of 79970729 in words is "seventy-nine million, nine hundred seventy thousand, seven hundred twenty-nine".