525306389 has 2 divisors, whose sum is σ = 525306390. Its totient is φ = 525306388.

The previous prime is 525306371. The next prime is 525306403. The reversal of 525306389 is 983603525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 508863364 + 16443025 = 22558^2 + 4055^2 .

It is a cyclic number.

It is not a de Polignac number, because 525306389 - 2¹⁶ = 525240853 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525306329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262653194 + 262653195.

It is an arithmetic number, because the mean of its divisors is an integer number (262653195).

Almost surely, 2^525306389 is an apocalyptic number.

It is an amenable number.

525306389 is a deficient number, since it is larger than the sum of its proper divisors (1).

525306389 is an equidigital number, since it uses as much as digits as its factorization.

525306389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 525306389 is about 22919.5634557031. The cubic root of 525306389 is about 806.8712248078.

The spelling of 525306389 in words is "five hundred twenty-five million, three hundred six thousand, three hundred eighty-nine".