501621265 has 16 divisors (see below), whose sum is σ = 637897680. Its totient is φ = 378004480.

The previous prime is 501621251. The next prime is 501621269. The reversal of 501621265 is 562126105.

It can be written as a sum of positive squares in 8 ways, for example, as 12680721 + 488940544 = 3561^2 + 22112^2 .

It is not a de Polignac number, because 501621265 - 2⁵ = 501621233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (501621269) 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 15 ways as a sum of consecutive naturals, for example, 36244 + ... + 48133.

It is an arithmetic number, because the mean of its divisors is an integer number (39868605).

Almost surely, 2^501621265 is an apocalyptic number.

It is an amenable number.

501621265 is a deficient number, since it is larger than the sum of its proper divisors (136276415).

501621265 is a wasteful number, since it uses less digits than its factorization.

501621265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84452.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 501621265 is about 22396.9030225163. The cubic root of 501621265 is about 794.5574663543.

The spelling of 501621265 in words is "five hundred one million, six hundred twenty-one thousand, two hundred sixty-five".