981513217 has 8 divisors (see below), whose sum is σ = 996743456. Its totient is φ = 966300192.

The previous prime is 981513187. The next prime is 981513223. The reversal of 981513217 is 712315189.

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 981513217 - 2⁷ = 981513089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981513257) 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, 156178 + ... + 162340.

It is an arithmetic number, because the mean of its divisors is an integer number (124592932).

Almost surely, 2^981513217 is an apocalyptic number.

It is an amenable number.

981513217 is a deficient number, since it is larger than the sum of its proper divisors (15230239).

981513217 is a wasteful number, since it uses less digits than its factorization.

981513217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8607.

The product of its digits is 15120, while the sum is 37.

The square root of 981513217 is about 31329.1113343484. Note that the first 3 decimals coincide. The cubic root of 981513217 is about 993.7993706627.

It can be divided in two parts, 9815 and 13217, that added together give a palindrome (23032).

The spelling of 981513217 in words is "nine hundred eighty-one million, five hundred thirteen thousand, two hundred seventeen".