879999709981 has 4 divisors (see below), whose sum is σ = 1005713954272. Its totient is φ = 754285465692.

The previous prime is 879999709973. The next prime is 879999710021. The reversal of 879999709981 is 189907999978.

879999709981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 879999709981 - 2³ = 879999709973 is a prime.

It is a super-2 number, since 2×879999709981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879999709951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62857122135 + ... + 62857122148.

It is an arithmetic number, because the mean of its divisors is an integer number (251428488568).

Almost surely, 2^879999709981 is an apocalyptic number.

It is an amenable number.

879999709981 is a deficient number, since it is larger than the sum of its proper divisors (125714244291).

879999709981 is a wasteful number, since it uses less digits than its factorization.

879999709981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125714244290.

The product of its (nonzero) digits is 1666598976, while the sum is 85.

The spelling of 879999709981 in words is "eight hundred seventy-nine billion, nine hundred ninety-nine million, seven hundred nine thousand, nine hundred eighty-one".