505654997 has 2 divisors, whose sum is σ = 505654998. Its totient is φ = 505654996.

The previous prime is 505654979. The next prime is 505655011. The reversal of 505654997 is 799456505.

It is a happy number.

Together with previous prime (505654979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492795601 + 12859396 = 22199^2 + 3586^2 .

It is a cyclic number.

It is not a de Polignac number, because 505654997 - 2⁸ = 505654741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505654907) 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, 252827498 + 252827499.

It is an arithmetic number, because the mean of its divisors is an integer number (252827499).

Almost surely, 2^505654997 is an apocalyptic number.

It is an amenable number.

505654997 is a deficient number, since it is larger than the sum of its proper divisors (1).

505654997 is an equidigital number, since it uses as much as digits as its factorization.

505654997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1701000, while the sum is 50.

The square root of 505654997 is about 22486.7738237391. The cubic root of 505654997 is about 796.6815649562.

The spelling of 505654997 in words is "five hundred five million, six hundred fifty-four thousand, nine hundred ninety-seven".