501143681 has 2 divisors, whose sum is σ = 501143682. Its totient is φ = 501143680.

The previous prime is 501143653. The next prime is 501143683. The reversal of 501143681 is 186341105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319837456 + 181306225 = 17884^2 + 13465^2 .

It is a cyclic number.

It is not a de Polignac number, because 501143681 - 2¹⁰ = 501142657 is a prime.

It is a super-2 number, since 2×501143681² = 502289978012459522, which contains 22 as substring.

Together with 501143683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (501143683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250571840 + 250571841.

It is an arithmetic number, because the mean of its divisors is an integer number (250571841).

Almost surely, 2^501143681 is an apocalyptic number.

It is an amenable number.

501143681 is a deficient number, since it is larger than the sum of its proper divisors (1).

501143681 is an equidigital number, since it uses as much as digits as its factorization.

501143681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 501143681 is about 22386.2386523507. The cubic root of 501143681 is about 794.3052253036.

Adding to 501143681 its reverse (186341105), we get a palindrome (687484786).

The spelling of 501143681 in words is "five hundred one million, one hundred forty-three thousand, six hundred eighty-one".