981917 has 4 divisors (see below), whose sum is σ = 998076. Its totient is φ = 965760.

The previous prime is 981913. The next prime is 981919. The reversal of 981917 is 719189.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 244036 + 737881 = 494^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 981917 - 2² = 981913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981917.

It is not an unprimeable number, because it can be changed into a prime (981913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7988 + ... + 8109.

It is an arithmetic number, because the mean of its divisors is an integer number (249519).

2⁹⁸¹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

981917 is a deficient number, since it is larger than the sum of its proper divisors (16159).

981917 is a wasteful number, since it uses less digits than its factorization.

981917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16158.

The product of its digits is 4536, while the sum is 35.

The square root of 981917 is about 990.9172518430. The cubic root of 981917 is about 99.3935631105.

The spelling of 981917 in words is "nine hundred eighty-one thousand, nine hundred seventeen".