505651 has 4 divisors (see below), whose sum is σ = 510400. Its totient is φ = 500904.

The previous prime is 505643. The next prime is 505657. The reversal of 505651 is 156505.

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

It is a cyclic number.

It is not a de Polignac number, because 505651 - 2³ = 505643 is a prime.

It is a Duffinian number.

505651 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (505657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2211 + ... + 2428.

It is an arithmetic number, because the mean of its divisors is an integer number (127600).

2⁵⁰⁵⁶⁵¹ is an apocalyptic number.

505651 is a deficient number, since it is larger than the sum of its proper divisors (4749).

505651 is a wasteful number, since it uses less digits than its factorization.

505651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4748.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 505651 is about 711.0914146578. The cubic root of 505651 is about 79.6679465801.

It can be divided in two parts, 505 and 651, that added together give a square (1156 = 34²).

The spelling of 505651 in words is "five hundred five thousand, six hundred fifty-one".