331545221 has 24 divisors (see below), whose sum is σ = 394246656. Its totient is φ = 277935840.

The previous prime is 331545167. The next prime is 331545233. The reversal of 331545221 is 122545133.

It is a happy number.

It is not a de Polignac number, because 331545221 - 2¹⁰ = 331544197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331545241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 545900 + ... + 546506.

It is an arithmetic number, because the mean of its divisors is an integer number (16426944).

Almost surely, 2^331545221 is an apocalyptic number.

It is an amenable number.

331545221 is a deficient number, since it is larger than the sum of its proper divisors (62701435).

331545221 is a wasteful number, since it uses less digits than its factorization.

331545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 842 counting only the distinct ones).

The product of its digits is 3600, while the sum is 26.

The square root of 331545221 is about 18208.3832615639. The cubic root of 331545221 is about 692.1192429583.

The spelling of 331545221 in words is "three hundred thirty-one million, five hundred forty-five thousand, two hundred twenty-one".