525563581 has 2 divisors, whose sum is σ = 525563582. Its totient is φ = 525563580.

The previous prime is 525563561. The next prime is 525563609. The reversal of 525563581 is 185365525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488852100 + 36711481 = 22110^2 + 6059^2 .

It is a cyclic number.

It is not a de Polignac number, because 525563581 - 2⁷ = 525563453 is a prime.

It is a super-2 number, since 2×525563581² = 552434155347087122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525563531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262781790 + 262781791.

It is an arithmetic number, because the mean of its divisors is an integer number (262781791).

Almost surely, 2^525563581 is an apocalyptic number.

It is an amenable number.

525563581 is a deficient number, since it is larger than the sum of its proper divisors (1).

525563581 is an equidigital number, since it uses as much as digits as its factorization.

525563581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180000, while the sum is 40.

The square root of 525563581 is about 22925.1735216988. The cubic root of 525563581 is about 807.0028857267.

The spelling of 525563581 in words is "five hundred twenty-five million, five hundred sixty-three thousand, five hundred eighty-one".