506191691 has 2 divisors, whose sum is σ = 506191692. Its totient is φ = 506191690.

The previous prime is 506191669. The next prime is 506191727. The reversal of 506191691 is 196191605.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506191691 is a prime.

It is not a weakly prime, because it can be changed into another prime (506191661) 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, 253095845 + 253095846.

It is an arithmetic number, because the mean of its divisors is an integer number (253095846).

Almost surely, 2^506191691 is an apocalyptic number.

506191691 is a deficient number, since it is larger than the sum of its proper divisors (1).

506191691 is an equidigital number, since it uses as much as digits as its factorization.

506191691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 506191691 is about 22498.7042071316. The cubic root of 506191691 is about 796.9633269178.

The spelling of 506191691 in words is "five hundred six million, one hundred ninety-one thousand, six hundred ninety-one".