79213203581 has 2 divisors, whose sum is σ = 79213203582. Its totient is φ = 79213203580.

The previous prime is 79213203577. The next prime is 79213203593. The reversal of 79213203581 is 18530231297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46861425625 + 32351777956 = 216475^2 + 179866^2 .

It is a cyclic number.

It is not a de Polignac number, because 79213203581 - 2² = 79213203577 is a prime.

It is a super-2 number, since 2×79213203581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79213203481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39606601790 + 39606601791.

It is an arithmetic number, because the mean of its divisors is an integer number (39606601791).

Almost surely, 2^79213203581 is an apocalyptic number.

It is an amenable number.

79213203581 is a deficient number, since it is larger than the sum of its proper divisors (1).

79213203581 is an equidigital number, since it uses as much as digits as its factorization.

79213203581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 79213203581 in words is "seventy-nine billion, two hundred thirteen million, two hundred three thousand, five hundred eighty-one".