981817 has 2 divisors, whose sum is σ = 981818. Its totient is φ = 981816.

The previous prime is 981811. The next prime is 981823. The reversal of 981817 is 718189.

It is a balanced prime because it is at equal distance from previous prime (981811) and next prime (981823).

It can be written as a sum of positive squares in only one way, i.e., 952576 + 29241 = 976^2 + 171^2 .

It is a cyclic number.

It is not a de Polignac number, because 981817 - 2³ = 981809 is a prime.

It is not a weakly prime, because it can be changed into another prime (981811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490908 + 490909.

It is an arithmetic number, because the mean of its divisors is an integer number (490909).

2⁹⁸¹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

981817 is a deficient number, since it is larger than the sum of its proper divisors (1).

981817 is an equidigital number, since it uses as much as digits as its factorization.

981817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 34.

The square root of 981817 is about 990.8667922582. The cubic root of 981817 is about 99.3901888628.

The spelling of 981817 in words is "nine hundred eighty-one thousand, eight hundred seventeen".