7531164221 has 16 divisors (see below), whose sum is σ = 8786448000. Its totient is φ = 6452528544.

The previous prime is 7531164163. The next prime is 7531164259. The reversal of 7531164221 is 1224611357.

7531164221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7531164221 - 2²² = 7526969917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7531164281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1590185 + ... + 1594913.

It is an arithmetic number, because the mean of its divisors is an integer number (549153000).

Almost surely, 2^7531164221 is an apocalyptic number.

It is an amenable number.

7531164221 is a deficient number, since it is larger than the sum of its proper divisors (1255283779).

7531164221 is an equidigital number, since it uses as much as digits as its factorization.

7531164221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9393 (or 9379 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 7531164221 is about 86782.2805704022. The cubic root of 7531164221 is about 1960.1412695795.

Adding to 7531164221 its reverse (1224611357), we get a palindrome (8755775578).

The spelling of 7531164221 in words is "seven billion, five hundred thirty-one million, one hundred sixty-four thousand, two hundred twenty-one".