501163865 has 4 divisors (see below), whose sum is σ = 601396644. Its totient is φ = 400931088.

The previous prime is 501163849. The next prime is 501163879. The reversal of 501163865 is 568361105.

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 187909264 + 313254601 = 13708^2 + 17699^2 .

It is a cyclic number.

It is not a de Polignac number, because 501163865 - 2⁴ = 501163849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50116382 + ... + 50116391.

It is an arithmetic number, because the mean of its divisors is an integer number (150349161).

Almost surely, 2^501163865 is an apocalyptic number.

It is an amenable number.

501163865 is a deficient number, since it is larger than the sum of its proper divisors (100232779).

501163865 is a wasteful number, since it uses less digits than its factorization.

501163865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100232778.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 501163865 is about 22386.6894604808. The cubic root of 501163865 is about 794.3158889396.

The spelling of 501163865 in words is "five hundred one million, one hundred sixty-three thousand, eight hundred sixty-five".