525861 has 24 divisors (see below), whose sum is σ = 921024. Its totient is φ = 282240.

The previous prime is 525839. The next prime is 525869. The reversal of 525861 is 168525.

It is not a de Polignac number, because 525861 - 2¹⁴ = 509477 is a prime.

525861 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 525861.

It is not an unprimeable number, because it can be changed into a prime (525869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 826 + ... + 1316.

It is an arithmetic number, because the mean of its divisors is an integer number (38376).

2⁵²⁵⁸⁶¹ is an apocalyptic number.

525861 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

525861 is a deficient number, since it is larger than the sum of its proper divisors (395163).

525861 is a wasteful number, since it uses less digits than its factorization.

525861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 518 counting only the distinct ones).

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

The square root of 525861 is about 725.1627403556. The cubic root of 525861 is about 80.7155085980.

The spelling of 525861 in words is "five hundred twenty-five thousand, eight hundred sixty-one".