7518797521 has 3 divisors (see below), whose sum is σ = 7518884233. Its totient is φ = 7518710810.

The previous prime is 7518797513. The next prime is 7518797557. The reversal of 7518797521 is 1257978157.

The square root of 7518797521 is 86711.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1257978157 = 25537 ⋅49261.

It is not a de Polignac number, because 7518797521 - 2³ = 7518797513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7518791521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 43356 + ... + 130066.

Almost surely, 2^7518797521 is an apocalyptic number.

7518797521 is the 86711-st square number.

7518797521 is the 43356-th centered octagonal number.

It is an amenable number.

7518797521 is a deficient number, since it is larger than the sum of its proper divisors (86712).

7518797521 is an frugal number, since it uses more digits than its factorization.

7518797521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173422 (or 86711 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 52.

The cubic root of 7518797521 is about 1959.0677852932.

The spelling of 7518797521 in words is "seven billion, five hundred eighteen million, seven hundred ninety-seven thousand, five hundred twenty-one".