79702489 has 2 divisors, whose sum is σ = 79702490. Its totient is φ = 79702488.

The previous prime is 79702453. The next prime is 79702499. The reversal of 79702489 is 98420797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73616400 + 6086089 = 8580^2 + 2467^2 .

It is an emirp because it is prime and its reverse (98420797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79702489 - 2¹³ = 79694297 is a prime.

It is not a weakly prime, because it can be changed into another prime (79702499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39851244 + 39851245.

It is an arithmetic number, because the mean of its divisors is an integer number (39851245).

Almost surely, 2^79702489 is an apocalyptic number.

It is an amenable number.

79702489 is a deficient number, since it is larger than the sum of its proper divisors (1).

79702489 is an equidigital number, since it uses as much as digits as its factorization.

79702489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 79702489 is about 8927.6250481301. The cubic root of 79702489 is about 430.3521344835.

The spelling of 79702489 in words is "seventy-nine million, seven hundred two thousand, four hundred eighty-nine".