505501691 has 2 divisors, whose sum is σ = 505501692. Its totient is φ = 505501690.

The previous prime is 505501673. The next prime is 505501723. The reversal of 505501691 is 196105505.

It is an a-pointer prime, because the next prime (505501723) can be obtained adding 505501691 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505501691 - 2⁶ = 505501627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505501891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252750845 + 252750846.

It is an arithmetic number, because the mean of its divisors is an integer number (252750846).

Almost surely, 2^505501691 is an apocalyptic number.

505501691 is a deficient number, since it is larger than the sum of its proper divisors (1).

505501691 is an equidigital number, since it uses as much as digits as its factorization.

505501691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 505501691 is about 22483.3647615298. The cubic root of 505501691 is about 796.6010433819.

The spelling of 505501691 in words is "five hundred five million, five hundred one thousand, six hundred ninety-one".