981811221 has 8 divisors (see below), whose sum is σ = 1309418880. Its totient is φ = 654372192.

The previous prime is 981811177. The next prime is 981811223. The reversal of 981811221 is 122118189.

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

It is a de Polignac number, because none of the positive numbers 2^k-981811221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981811223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27880 + ... + 52353.

It is an arithmetic number, because the mean of its divisors is an integer number (163677360).

Almost surely, 2^981811221 is an apocalyptic number.

It is an amenable number.

981811221 is a deficient number, since it is larger than the sum of its proper divisors (327607659).

981811221 is a wasteful number, since it uses less digits than its factorization.

981811221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84315.

The product of its digits is 2304, while the sum is 33.

The square root of 981811221 is about 31333.8669972284. The cubic root of 981811221 is about 993.8999385800.

The spelling of 981811221 in words is "nine hundred eighty-one million, eight hundred eleven thousand, two hundred twenty-one".