501322561 has 2 divisors, whose sum is σ = 501322562. Its totient is φ = 501322560.

The previous prime is 501322541. The next prime is 501322589. The reversal of 501322561 is 165223105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452880961 + 48441600 = 21281^2 + 6960^2 .

It is a cyclic number.

It is not a de Polignac number, because 501322561 - 2⁷ = 501322433 is a prime.

It is not a weakly prime, because it can be changed into another prime (501322511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250661280 + 250661281.

It is an arithmetic number, because the mean of its divisors is an integer number (250661281).

Almost surely, 2^501322561 is an apocalyptic number.

It is an amenable number.

501322561 is a deficient number, since it is larger than the sum of its proper divisors (1).

501322561 is an equidigital number, since it uses as much as digits as its factorization.

501322561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 501322561 is about 22390.2336075352. The cubic root of 501322561 is about 794.3997214345.

Adding to 501322561 its reverse (165223105), we get a palindrome (666545666).

The spelling of 501322561 in words is "five hundred one million, three hundred twenty-two thousand, five hundred sixty-one".