981217 has 8 divisors (see below), whose sum is σ = 1057760. Its totient is φ = 907200.

The previous prime is 981209. The next prime is 981221. The reversal of 981217 is 712189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 981217 - 2³ = 981209 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (981287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217 + ... + 1417.

It is an arithmetic number, because the mean of its divisors is an integer number (132220).

2⁹⁸¹²¹⁷ is an apocalyptic number.

It is an amenable number.

981217 is a deficient number, since it is larger than the sum of its proper divisors (76543).

981217 is a wasteful number, since it uses less digits than its factorization.

981217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263.

The product of its digits is 1008, while the sum is 28.

The square root of 981217 is about 990.5639807706. The cubic root of 981217 is about 99.3699385632.

Subtracting from 981217 its sum of digits (28), we obtain a palindrome (981189).

The spelling of 981217 in words is "nine hundred eighty-one thousand, two hundred seventeen".