731003221 has 8 divisors (see below), whose sum is σ = 787467744. Its totient is φ = 674572080.

The previous prime is 731003201. The next prime is 731003233. The reversal of 731003221 is 122300137.

731003221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 731003221 - 2¹³ = 730995029 is a prime.

It is a super-2 number, since 2×731003221² = 1068731418224749682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731003201) 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, 54990 + ... + 66976.

It is an arithmetic number, because the mean of its divisors is an integer number (98433468).

Almost surely, 2^731003221 is an apocalyptic number.

It is an amenable number.

731003221 is a deficient number, since it is larger than the sum of its proper divisors (56464523).

731003221 is a wasteful number, since it uses less digits than its factorization.

731003221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16691.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 731003221 is about 27037.0712356202. The cubic root of 731003221 is about 900.8236168357.

Adding to 731003221 its reverse (122300137), we get a palindrome (853303358).

The spelling of 731003221 in words is "seven hundred thirty-one million, three thousand, two hundred twenty-one".