501605506 has 4 divisors (see below), whose sum is σ = 752408262. Its totient is φ = 250802752.

The previous prime is 501605477. The next prime is 501605509. The reversal of 501605506 is 605506105.

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

It can be written as a sum of positive squares in only one way, i.e., 430355025 + 71250481 = 20745^2 + 8441^2 .

It is not an unprimeable number, because it can be changed into a prime (501605509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125401375 + ... + 125401378.

Almost surely, 2^501605506 is an apocalyptic number.

501605506 is a deficient number, since it is larger than the sum of its proper divisors (250802756).

501605506 is a wasteful number, since it uses less digits than its factorization.

501605506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250802755.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 501605506 is about 22396.5512077195. The cubic root of 501605506 is about 794.5491456264.

The spelling of 501605506 in words is "five hundred one million, six hundred five thousand, five hundred six".