505998431 has 2 divisors, whose sum is σ = 505998432. Its totient is φ = 505998430.

The previous prime is 505998391. The next prime is 505998439. The reversal of 505998431 is 134899505.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505998431 - 2¹⁴ = 505982047 is a prime.

It is a super-2 number, since 2×505998431² = 512068824348923522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505998439) 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, 252999215 + 252999216.

It is an arithmetic number, because the mean of its divisors is an integer number (252999216).

Almost surely, 2^505998431 is an apocalyptic number.

505998431 is a deficient number, since it is larger than the sum of its proper divisors (1).

505998431 is an equidigital number, since it uses as much as digits as its factorization.

505998431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 505998431 is about 22494.4088830980. The cubic root of 505998431 is about 796.8618892340.

The spelling of 505998431 in words is "five hundred five million, nine hundred ninety-eight thousand, four hundred thirty-one".