79880881 has 2 divisors, whose sum is σ = 79880882. Its totient is φ = 79880880.

The previous prime is 79880873. The next prime is 79880897. The reversal of 79880881 is 18808897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79834225 + 46656 = 8935^2 + 216^2 .

It is an emirp because it is prime and its reverse (18808897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79880881 - 2³ = 79880873 is a prime.

It is a super-2 number, since 2×79880881² = 12761910298672322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79880861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39940440 + 39940441.

It is an arithmetic number, because the mean of its divisors is an integer number (39940441).

Almost surely, 2^79880881 is an apocalyptic number.

It is an amenable number.

79880881 is a deficient number, since it is larger than the sum of its proper divisors (1).

79880881 is an equidigital number, since it uses as much as digits as its factorization.

79880881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 79880881 is about 8937.6104748417. The cubic root of 79880881 is about 430.6729700178.

The spelling of 79880881 in words is "seventy-nine million, eight hundred eighty thousand, eight hundred eighty-one".