501131243 has 2 divisors, whose sum is σ = 501131244. Its totient is φ = 501131242.

The previous prime is 501131227. The next prime is 501131269. The reversal of 501131243 is 342131105.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 501131243 - 2⁴ = 501131227 is a prime.

It is a super-2 number, since 2×501131243² = 502265045421450098, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (501131273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250565621 + 250565622.

It is an arithmetic number, because the mean of its divisors is an integer number (250565622).

Almost surely, 2^501131243 is an apocalyptic number.

501131243 is a deficient number, since it is larger than the sum of its proper divisors (1).

501131243 is an equidigital number, since it uses as much as digits as its factorization.

501131243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 501131243 is about 22385.9608460303. The cubic root of 501131243 is about 794.2986539014.

Adding to 501131243 its reverse (342131105), we get a palindrome (843262348).

The spelling of 501131243 in words is "five hundred one million, one hundred thirty-one thousand, two hundred forty-three".