525491 has 2 divisors, whose sum is σ = 525492. Its totient is φ = 525490.

The previous prime is 525467. The next prime is 525493. The reversal of 525491 is 194525.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525491 is a prime.

It is a super-2 number, since 2×525491² = 552281582162, which contains 22 as substring.

Together with 525493, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 525491.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 525491.

It is not a weakly prime, because it can be changed into another prime (525493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262745 + 262746.

It is an arithmetic number, because the mean of its divisors is an integer number (262746).

2⁵²⁵⁴⁹¹ is an apocalyptic number.

525491 is a deficient number, since it is larger than the sum of its proper divisors (1).

525491 is an equidigital number, since it uses as much as digits as its factorization.

525491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 525491 is about 724.9075803163. The cubic root of 525491 is about 80.6965734641.

The spelling of 525491 in words is "five hundred twenty-five thousand, four hundred ninety-one".