7551243121 has 4 divisors (see below), whose sum is σ = 7551899200. Its totient is φ = 7550587044.

The previous prime is 7551243103. The next prime is 7551243191. The reversal of 7551243121 is 1213421557.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7551243121 - 2¹¹ = 7551241073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7551243191) 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, 310461 + ... + 333898.

It is an arithmetic number, because the mean of its divisors is an integer number (1887974800).

Almost surely, 2^7551243121 is an apocalyptic number.

It is an amenable number.

7551243121 is a deficient number, since it is larger than the sum of its proper divisors (656079).

7551243121 is a wasteful number, since it uses less digits than its factorization.

7551243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656078.

The product of its digits is 8400, while the sum is 31.

The square root of 7551243121 is about 86897.8890480085. The cubic root of 7551243121 is about 1961.8817067813.

Adding to 7551243121 its reverse (1213421557), we get a palindrome (8764664678).

The spelling of 7551243121 in words is "seven billion, five hundred fifty-one million, two hundred forty-three thousand, one hundred twenty-one".