7531112521 has 4 divisors (see below), whose sum is σ = 7654573444. Its totient is φ = 7407651600.

The previous prime is 7531112513. The next prime is 7531112543. The reversal of 7531112521 is 1252111357.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 872552521 + 6658560000 = 29539^2 + 81600^2 .

It is a cyclic number.

It is not a de Polignac number, because 7531112521 - 2³ = 7531112513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7531112521.

It is not an unprimeable number, because it can be changed into a prime (7531112551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61730370 + ... + 61730491.

It is an arithmetic number, because the mean of its divisors is an integer number (1913643361).

Almost surely, 2^7531112521 is an apocalyptic number.

It is an amenable number.

7531112521 is a deficient number, since it is larger than the sum of its proper divisors (123460923).

7531112521 is a wasteful number, since it uses less digits than its factorization.

7531112521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123460922.

The product of its digits is 2100, while the sum is 28.

The square root of 7531112521 is about 86781.9826980232. The cubic root of 7531112521 is about 1960.1367842377.

Adding to 7531112521 its reverse (1252111357), we get a palindrome (8783223878).

The spelling of 7531112521 in words is "seven billion, five hundred thirty-one million, one hundred twelve thousand, five hundred twenty-one".