79902709 has 2 divisors, whose sum is σ = 79902710. Its totient is φ = 79902708.

The previous prime is 79902671. The next prime is 79902731. The reversal of 79902709 is 90720997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77880625 + 2022084 = 8825^2 + 1422^2 .

It is an emirp because it is prime and its reverse (90720997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79902709 - 2¹¹ = 79900661 is a prime.

It is a super-4 number, since 4×79902709⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79902799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39951354 + 39951355.

It is an arithmetic number, because the mean of its divisors is an integer number (39951355).

Almost surely, 2^79902709 is an apocalyptic number.

It is an amenable number.

79902709 is a deficient number, since it is larger than the sum of its proper divisors (1).

79902709 is an equidigital number, since it uses as much as digits as its factorization.

79902709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 79902709 is about 8938.8315231914. The cubic root of 79902709 is about 430.7121945620.

It can be divided in two parts, 7990 and 2709, that multiplied together give a triangular number (21644910 = T₆₅₇₉).

The spelling of 79902709 in words is "seventy-nine million, nine hundred two thousand, seven hundred nine".