816525 has 36 divisors (see below), whose sum is σ = 1547520. Its totient is φ = 410400.

The previous prime is 816521. The next prime is 816539. The reversal of 816525 is 525618.

816525 is a `hidden beast` number, since 8 + 1 + 652 + 5 = 666.

It is not a de Polignac number, because 816525 - 2² = 816521 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4180 + ... + 4370.

2⁸¹⁶⁵²⁵ is an apocalyptic number.

It is an amenable number.

816525 is a deficient number, since it is larger than the sum of its proper divisors (730995).

816525 is a wasteful number, since it uses less digits than its factorization.

816525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 218 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 816525 is about 903.6177289097. The cubic root of 816525 is about 93.4666108964.

The spelling of 816525 in words is "eight hundred sixteen thousand, five hundred twenty-five".