525781 has 2 divisors, whose sum is σ = 525782. Its totient is φ = 525780.

The previous prime is 525773. The next prime is 525809. The reversal of 525781 is 187525.

It is an a-pointer prime, because the next prime (525809) can be obtained adding 525781 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 128881 = 630^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 525781 - 2³ = 525773 is a prime.

It is a super-2 number, since 2×525781² = 552891319922, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262890 + 262891.

It is an arithmetic number, because the mean of its divisors is an integer number (262891).

2⁵²⁵⁷⁸¹ is an apocalyptic number.

It is an amenable number.

525781 is a deficient number, since it is larger than the sum of its proper divisors (1).

525781 is an equidigital number, since it uses as much as digits as its factorization.

525781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2800, while the sum is 28.

The square root of 525781 is about 725.1075782255. The cubic root of 525781 is about 80.7114152677.

The spelling of 525781 in words is "five hundred twenty-five thousand, seven hundred eighty-one".