31221441 has 6 divisors (see below), whose sum is σ = 45097650. Its totient is φ = 20814288.

The previous prime is 31221431. The next prime is 31221457. The reversal of 31221441 is 14412213.

31221441 is a `hidden beast` number, since 3 + 1 + 221 + 441 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26998416 + 4223025 = 5196^2 + 2055^2 .

It is not a de Polignac number, because 31221441 - 2¹¹ = 31219393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31221431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1734516 + ... + 1734533.

It is an arithmetic number, because the mean of its divisors is an integer number (7516275).

Almost surely, 2^31221441 is an apocalyptic number.

It is an amenable number.

31221441 is a deficient number, since it is larger than the sum of its proper divisors (13876209).

31221441 is a wasteful number, since it uses less digits than its factorization.

31221441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469055 (or 3469052 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 31221441 is about 5587.6149652602. The cubic root of 31221441 is about 314.8842810016.

Adding to 31221441 its reverse (14412213), we get a palindrome (45633654).

The spelling of 31221441 in words is "thirty-one million, two hundred twenty-one thousand, four hundred forty-one".