988861 has 2 divisors, whose sum is σ = 988862. Its totient is φ = 988860.

The previous prime is 988859. The next prime is 988877. The reversal of 988861 is 168889.

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., 940900 + 47961 = 970^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 988861 - 2¹ = 988859 is a prime.

Together with 988859, it forms a pair of twin primes.

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 (988061) 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, 494430 + 494431.

It is an arithmetic number, because the mean of its divisors is an integer number (494431).

2⁹⁸⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

988861 is a deficient number, since it is larger than the sum of its proper divisors (1).

988861 is an equidigital number, since it uses as much as digits as its factorization.

988861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 40.

The square root of 988861 is about 994.4149033477. The cubic root of 988861 is about 99.6273127678.

It can be divided in two parts, 988 and 861, that added together give a square (1849 = 43²).

The spelling of 988861 in words is "nine hundred eighty-eight thousand, eight hundred sixty-one".