525518621 has 2 divisors, whose sum is σ = 525518622. Its totient is φ = 525518620.

The previous prime is 525518611. The next prime is 525518717. The reversal of 525518621 is 126815525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 520478596 + 5040025 = 22814^2 + 2245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525518621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525518611) 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 as a sum of consecutive naturals, namely, 262759310 + 262759311.

It is an arithmetic number, because the mean of its divisors is an integer number (262759311).

Almost surely, 2^525518621 is an apocalyptic number.

It is an amenable number.

525518621 is a deficient number, since it is larger than the sum of its proper divisors (1).

525518621 is an equidigital number, since it uses as much as digits as its factorization.

525518621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 35.

The square root of 525518621 is about 22924.1929192720. The cubic root of 525518621 is about 806.9798730436.

The spelling of 525518621 in words is "five hundred twenty-five million, five hundred eighteen thousand, six hundred twenty-one".