504642991 has 2 divisors, whose sum is σ = 504642992. Its totient is φ = 504642990.

The previous prime is 504642961. The next prime is 504642997. The reversal of 504642991 is 199246405.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 504642991 - 2⁵ = 504642959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (504642997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252321495 + 252321496.

It is an arithmetic number, because the mean of its divisors is an integer number (252321496).

Almost surely, 2^504642991 is an apocalyptic number.

504642991 is a deficient number, since it is larger than the sum of its proper divisors (1).

504642991 is an equidigital number, since it uses as much as digits as its factorization.

504642991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 504642991 is about 22464.2603038693. The cubic root of 504642991 is about 796.1497234206.

The spelling of 504642991 in words is "five hundred four million, six hundred forty-two thousand, nine hundred ninety-one".