501142321 has 2 divisors, whose sum is σ = 501142322. Its totient is φ = 501142320.

The previous prime is 501142259. The next prime is 501142349. The reversal of 501142321 is 123241105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490179600 + 10962721 = 22140^2 + 3311^2 .

It is a cyclic number.

It is not a de Polignac number, because 501142321 - 2¹³ = 501134129 is a prime.

It is a super-2 number, since 2×501142321² = 502287251794534082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (501142351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250571160 + 250571161.

It is an arithmetic number, because the mean of its divisors is an integer number (250571161).

Almost surely, 2^501142321 is an apocalyptic number.

It is an amenable number.

501142321 is a deficient number, since it is larger than the sum of its proper divisors (1).

501142321 is an equidigital number, since it uses as much as digits as its factorization.

501142321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 501142321 is about 22386.2082765260. The cubic root of 501142321 is about 794.3045067764.

Adding to 501142321 its reverse (123241105), we get a palindrome (624383426).

The spelling of 501142321 in words is "five hundred one million, one hundred forty-two thousand, three hundred twenty-one".