505695221 has 4 divisors (see below), whose sum is σ = 506427744. Its totient is φ = 504962700.

The previous prime is 505695193. The next prime is 505695233. The reversal of 505695221 is 122596505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505695221 - 2¹⁸ = 505433077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505695251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365225 + ... + 366606.

It is an arithmetic number, because the mean of its divisors is an integer number (126606936).

Almost surely, 2^505695221 is an apocalyptic number.

It is an amenable number.

505695221 is a deficient number, since it is larger than the sum of its proper divisors (732523).

505695221 is an equidigital number, since it uses as much as digits as its factorization.

505695221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732522.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 505695221 is about 22487.6681983704. The cubic root of 505695221 is about 796.7026892865.

The spelling of 505695221 in words is "five hundred five million, six hundred ninety-five thousand, two hundred twenty-one".