231221982 has 16 divisors (see below), whose sum is σ = 486783360. Its totient is φ = 73017432.

The previous prime is 231221957. The next prime is 231221983. The reversal of 231221982 is 289122132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221983) 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, 1014018 + ... + 1014245.

It is an arithmetic number, because the mean of its divisors is an integer number (30423960).

Almost surely, 2^231221982 is an apocalyptic number.

231221982 is an abundant number, since it is smaller than the sum of its proper divisors (255561378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231221982 is a wasteful number, since it uses less digits than its factorization.

231221982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028287.

The product of its digits is 3456, while the sum is 30.

The square root of 231221982 is about 15205.9850716749. The cubic root of 231221982 is about 613.7757229593.

The spelling of 231221982 in words is "two hundred thirty-one million, two hundred twenty-one thousand, nine hundred eighty-two".