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981317 = 8091213

981317 has 4 divisors (see below), whose sum is σ = 983340. Its totient is φ = 979296.

The previous prime is 981311. The next prime is 981319. The reversal of 981317 is 713189.

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 417316 + 564001 = 646^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 981317 - 24 = 981301 is a prime.

It is a deceptive number, since it divides R981316.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981317.

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 981317.

It is not an unprimeable number, because it can be changed into a prime (981311) 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, 203 + ... + 1415.

It is an arithmetic number, because the mean of its divisors is an integer number (245835).

2981317 is an apocalyptic number.

981317 is the 809-th pentagonal number.

It is an amenable number.

981317 is a deficient number, since it is larger than the sum of its proper divisors (2023).

981317 is a wasteful number, since it uses less digits than its factorization.

981317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022.

The product of its digits is 1512, while the sum is 29.

The square root of 981317 is about 990.6144557798. The cubic root of 981317 is about 99.3733141863.

The spelling of 981317 in words is "nine hundred eighty-one thousand, three hundred seventeen".

Divisors: 1 809 1213 981317