525434809 has 2 divisors, whose sum is σ = 525434810. Its totient is φ = 525434808.

The previous prime is 525434807. The next prime is 525434821. The reversal of 525434809 is 908434525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385533225 + 139901584 = 19635^2 + 11828^2 .

It is a cyclic number.

It is not a de Polignac number, because 525434809 - 2¹ = 525434807 is a prime.

Together with 525434807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (525434807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262717404 + 262717405.

It is an arithmetic number, because the mean of its divisors is an integer number (262717405).

Almost surely, 2^525434809 is an apocalyptic number.

It is an amenable number.

525434809 is a deficient number, since it is larger than the sum of its proper divisors (1).

525434809 is an equidigital number, since it uses as much as digits as its factorization.

525434809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 525434809 is about 22922.3648212832. The cubic root of 525434809 is about 806.9369705404.

The spelling of 525434809 in words is "five hundred twenty-five million, four hundred thirty-four thousand, eight hundred nine".