501782401 has 4 divisors (see below), whose sum is σ = 510008404. Its totient is φ = 493556400.

The previous prime is 501782357. The next prime is 501782417. The reversal of 501782401 is 104287105.

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 77422401 + 424360000 = 8799^2 + 20600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-501782401 is a prime.

It is the 22401-st Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501782401.

It is not an unprimeable number, because it can be changed into a prime (501782441) by changing a digit.

It is a nontrivial repunit in base 22400.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4112910 + ... + 4113031.

It is an arithmetic number, because the mean of its divisors is an integer number (127502101).

Almost surely, 2^501782401 is an apocalyptic number.

It is an amenable number.

501782401 is a deficient number, since it is larger than the sum of its proper divisors (8226003).

501782401 is an equidigital number, since it uses as much as digits as its factorization.

501782401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8226002.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 501782401 is about 22400.5000167407. The cubic root of 501782401 is about 794.6425359171.

The spelling of 501782401 in words is "five hundred one million, seven hundred eighty-two thousand, four hundred one".