79894302181 has 2 divisors, whose sum is σ = 79894302182. Its totient is φ = 79894302180.

The previous prime is 79894302179. The next prime is 79894302203. The reversal of 79894302181 is 18120349897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69779977281 + 10114324900 = 264159^2 + 100570^2 .

It is a cyclic number.

It is not a de Polignac number, because 79894302181 - 2¹ = 79894302179 is a prime.

It is a super-2 number, since 2×79894302181² (a number of 23 digits) contains 22 as substring.

Together with 79894302179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79894300181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39947151090 + 39947151091.

It is an arithmetic number, because the mean of its divisors is an integer number (39947151091).

Almost surely, 2^79894302181 is an apocalyptic number.

It is an amenable number.

79894302181 is a deficient number, since it is larger than the sum of its proper divisors (1).

79894302181 is an equidigital number, since it uses as much as digits as its factorization.

79894302181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 79894302181 in words is "seventy-nine billion, eight hundred ninety-four million, three hundred two thousand, one hundred eighty-one".