877661 has 2 divisors, whose sum is σ = 877662. Its totient is φ = 877660.

The previous prime is 877651. The next prime is 877699. The reversal of 877661 is 166778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755161 + 122500 = 869^2 + 350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-877661 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (877601) 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, 438830 + 438831.

It is an arithmetic number, because the mean of its divisors is an integer number (438831).

2⁸⁷⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

877661 is a deficient number, since it is larger than the sum of its proper divisors (1).

877661 is an equidigital number, since it uses as much as digits as its factorization.

877661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 877661 is about 936.8356312609. The cubic root of 877661 is about 95.7434192997.

The spelling of 877661 in words is "eight hundred seventy-seven thousand, six hundred sixty-one".