• 526 can be written using four 4's:

526 has 4 divisors (see below), whose sum is σ = 792. Its totient is φ = 262.

The previous prime is 523. The next prime is 541. The reversal of 526 is 625.

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

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 6 and base 12.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130 + ... + 133.

It is an arithmetic number, because the mean of its divisors is an integer number (198).

526 is the 15-th centered pentagonal number.

526 is a deficient number, since it is larger than the sum of its proper divisors (266).

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

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

The sum of its prime factors is 265.

The product of its digits is 60, while the sum is 13.

The square root of 526 is about 22.9346898824. The cubic root of 526 is about 8.0722619772.

Subtracting 526 from its reverse (625), we obtain a palindrome (99).

The spelling of 526 in words is "five hundred twenty-six", and thus it is an aban number and an oban number.

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