553431221 has 32 divisors (see below), whose sum is σ = 698664960. Its totient is φ = 427432896.

The previous prime is 553431191. The next prime is 553431227. The reversal of 553431221 is 122134355.

It is a happy number.

553431221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-553431221 is a prime.

It is a super-2 number, since 2×553431221² = 612572232755101682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553431227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 693995 + ... + 694791.

It is an arithmetic number, because the mean of its divisors is an integer number (21833280).

Almost surely, 2^553431221 is an apocalyptic number.

It is an amenable number.

553431221 is a deficient number, since it is larger than the sum of its proper divisors (145233739).

553431221 is a wasteful number, since it uses less digits than its factorization.

553431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073.

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

The square root of 553431221 is about 23525.1189370001. The cubic root of 553431221 is about 821.0215411511.

Adding to 553431221 its reverse (122134355), we get a palindrome (675565576).

The spelling of 553431221 in words is "five hundred fifty-three million, four hundred thirty-one thousand, two hundred twenty-one".