879661 has 2 divisors, whose sum is σ = 879662. Its totient is φ = 879660.

The previous prime is 879653. The next prime is 879667. The reversal of 879661 is 166978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 837225 + 42436 = 915^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 879661 - 2³ = 879653 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 879661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (879667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439830 + 439831.

It is an arithmetic number, because the mean of its divisors is an integer number (439831).

2⁸⁷⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

879661 is a deficient number, since it is larger than the sum of its proper divisors (1).

879661 is an equidigital number, since it uses as much as digits as its factorization.

879661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 879661 is about 937.9024469528. The cubic root of 879661 is about 95.8160903235.

It can be divided in two parts, 879 and 661, that added together give a triangular number (1540 = T₅₅).

The spelling of 879661 in words is "eight hundred seventy-nine thousand, six hundred sixty-one".