501431191 has 2 divisors, whose sum is σ = 501431192. Its totient is φ = 501431190.

The previous prime is 501431131. The next prime is 501431207. The reversal of 501431191 is 191134105.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 501431191 - 2¹⁵ = 501398423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501431101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250715595 + 250715596.

It is an arithmetic number, because the mean of its divisors is an integer number (250715596).

Almost surely, 2^501431191 is an apocalyptic number.

501431191 is a deficient number, since it is larger than the sum of its proper divisors (1).

501431191 is an equidigital number, since it uses as much as digits as its factorization.

501431191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 501431191 is about 22392.6593105866. The cubic root of 501431191 is about 794.4570959449.

Adding to 501431191 its reverse (191134105), we get a palindrome (692565296).

The spelling of 501431191 in words is "five hundred one million, four hundred thirty-one thousand, one hundred ninety-one".