525557 has 4 divisors (see below), whose sum is σ = 527340. Its totient is φ = 523776.

The previous prime is 525541. The next prime is 525571. The reversal of 525557 is 755525.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108241 + 417316 = 329^2 + 646^2 .

It is a cyclic number.

It is not a de Polignac number, because 525557 - 2⁴ = 525541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525517) 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, 332 + ... + 1077.

It is an arithmetic number, because the mean of its divisors is an integer number (131835).

2⁵²⁵⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

525557 is a deficient number, since it is larger than the sum of its proper divisors (1783).

525557 is a wasteful number, since it uses less digits than its factorization.

525557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its digits is 8750, while the sum is 29.

The square root of 525557 is about 724.9531019314. The cubic root of 525557 is about 80.6999517337.

The spelling of 525557 in words is "five hundred twenty-five thousand, five hundred fifty-seven".