505057691 has 2 divisors, whose sum is σ = 505057692. Its totient is φ = 505057690.

The previous prime is 505057687. The next prime is 505057697. The reversal of 505057691 is 196750505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505057691 - 2² = 505057687 is a prime.

It is not a weakly prime, because it can be changed into another prime (505057697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252528845 + 252528846.

It is an arithmetic number, because the mean of its divisors is an integer number (252528846).

Almost surely, 2^505057691 is an apocalyptic number.

505057691 is a deficient number, since it is larger than the sum of its proper divisors (1).

505057691 is an equidigital number, since it uses as much as digits as its factorization.

505057691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 505057691 is about 22473.4886254894. The cubic root of 505057691 is about 796.3677474482.

The spelling of 505057691 in words is "five hundred five million, fifty-seven thousand, six hundred ninety-one".