825501 has 4 divisors (see below), whose sum is σ = 1100672. Its totient is φ = 550332.

The previous prime is 825491. The next prime is 825509. The reversal of 825501 is 105528.

825501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 825501 - 2¹⁰ = 824477 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

825501 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137581 + ... + 137586.

It is an arithmetic number, because the mean of its divisors is an integer number (275168).

2⁸²⁵⁵⁰¹ is an apocalyptic number.

It is an amenable number.

825501 is a deficient number, since it is larger than the sum of its proper divisors (275171).

825501 is a wasteful number, since it uses less digits than its factorization.

825501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275170.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 825501 is about 908.5708557950. The cubic root of 825501 is about 93.8078540681.

It can be divided in two parts, 825 and 501, that added together give a triangular number (1326 = T₅₁).

The spelling of 825501 in words is "eight hundred twenty-five thousand, five hundred one".