5124551521 has 4 divisors (see below), whose sum is σ = 5124791700. Its totient is φ = 5124311344.

The previous prime is 5124551513. The next prime is 5124551527. The reversal of 5124551521 is 1251554215.

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 667653921 + 4456897600 = 25839^2 + 66760^2 .

It is a cyclic number.

It is not a de Polignac number, because 5124551521 - 2³ = 5124551513 is a prime.

It is a super-2 number, since 2×5124551521² = 52522056582766826882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5124551527) 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, 84586 + ... + 131923.

It is an arithmetic number, because the mean of its divisors is an integer number (1281197925).

Almost surely, 2^5124551521 is an apocalyptic number.

It is an amenable number.

5124551521 is a deficient number, since it is larger than the sum of its proper divisors (240179).

5124551521 is a wasteful number, since it uses less digits than its factorization.

5124551521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240178.

The product of its digits is 10000, while the sum is 31.

The square root of 5124551521 is about 71585.9729346469. The cubic root of 5124551521 is about 1724.0583275692.

The spelling of 5124551521 in words is "five billion, one hundred twenty-four million, five hundred fifty-one thousand, five hundred twenty-one".