505965691 has 16 divisors (see below), whose sum is σ = 638807040. Its totient is φ = 389263680.

The previous prime is 505965689. The next prime is 505965731. The reversal of 505965691 is 196569505.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 505965691 - 2¹ = 505965689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505965671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35506 + ... + 47671.

It is an arithmetic number, because the mean of its divisors is an integer number (39925440).

Almost surely, 2^505965691 is an apocalyptic number.

505965691 is a deficient number, since it is larger than the sum of its proper divisors (132841349).

505965691 is a wasteful number, since it uses less digits than its factorization.

505965691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83274.

The product of its (nonzero) digits is 364500, while the sum is 46.

The square root of 505965691 is about 22493.6811349321. The cubic root of 505965691 is about 796.8447022104.

The spelling of 505965691 in words is "five hundred five million, nine hundred sixty-five thousand, six hundred ninety-one".