879947909 has 2 divisors, whose sum is σ = 879947910. Its totient is φ = 879947908.

The previous prime is 879947903. The next prime is 879947911. The reversal of 879947909 is 909749978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 759167809 + 120780100 = 27553^2 + 10990^2 .

It is a cyclic number.

It is not a de Polignac number, because 879947909 - 2¹⁶ = 879882373 is a prime.

Together with 879947911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (879947903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439973954 + 439973955.

It is an arithmetic number, because the mean of its divisors is an integer number (439973955).

Almost surely, 2^879947909 is an apocalyptic number.

It is an amenable number.

879947909 is a deficient number, since it is larger than the sum of its proper divisors (1).

879947909 is an equidigital number, since it uses as much as digits as its factorization.

879947909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10287648, while the sum is 62.

The square root of 879947909 is about 29663.9159417633. The cubic root of 879947909 is about 958.2650627174.

The spelling of 879947909 in words is "eight hundred seventy-nine million, nine hundred forty-seven thousand, nine hundred nine".