501868849 has 4 divisors (see below), whose sum is σ = 531390564. Its totient is φ = 472347136.

The previous prime is 501868847. The next prime is 501868891. The reversal of 501868849 is 948868105.

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 421891600 + 79977249 = 20540^2 + 8943^2 .

It is a cyclic number.

It is not a de Polignac number, because 501868849 - 2¹ = 501868847 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501868847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14760832 + ... + 14760865.

It is an arithmetic number, because the mean of its divisors is an integer number (132847641).

Almost surely, 2^501868849 is an apocalyptic number.

It is an amenable number.

501868849 is a deficient number, since it is larger than the sum of its proper divisors (29521715).

501868849 is a wasteful number, since it uses less digits than its factorization.

501868849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29521714.

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 501868849 is about 22402.4295334234. The cubic root of 501868849 is about 794.6881674586.

The spelling of 501868849 in words is "five hundred one million, eight hundred sixty-eight thousand, eight hundred forty-nine".