977861 has 2 divisors, whose sum is σ = 977862. Its totient is φ = 977860.

The previous prime is 977849. The next prime is 977881. The reversal of 977861 is 168779.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 185761 = 890^2 + 431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-977861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977831) 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, 488930 + 488931.

It is an arithmetic number, because the mean of its divisors is an integer number (488931).

2⁹⁷⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

977861 is a deficient number, since it is larger than the sum of its proper divisors (1).

977861 is an equidigital number, since it uses as much as digits as its factorization.

977861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 977861 is about 988.8685453588. The cubic root of 977861 is about 99.2565193982.

The spelling of 977861 in words is "nine hundred seventy-seven thousand, eight hundred sixty-one".