879181993 has 2 divisors, whose sum is σ = 879181994. Its totient is φ = 879181992.

The previous prime is 879181943. The next prime is 879182027. The reversal of 879181993 is 399181978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677456784 + 201725209 = 26028^2 + 14203^2 .

It is a cyclic number.

It is not a de Polignac number, because 879181993 - 2²¹ = 877084841 is a prime.

It is not a weakly prime, because it can be changed into another prime (879181943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439590996 + 439590997.

It is an arithmetic number, because the mean of its divisors is an integer number (439590997).

Almost surely, 2^879181993 is an apocalyptic number.

It is an amenable number.

879181993 is a deficient number, since it is larger than the sum of its proper divisors (1).

879181993 is an equidigital number, since it uses as much as digits as its factorization.

879181993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 55.

The square root of 879181993 is about 29651.0032376647. The cubic root of 879181993 is about 957.9869539848.

The spelling of 879181993 in words is "eight hundred seventy-nine million, one hundred eighty-one thousand, nine hundred ninety-three".