505216401 has 4 divisors (see below), whose sum is σ = 673621872. Its totient is φ = 336810932.

The previous prime is 505216379. The next prime is 505216427. The reversal of 505216401 is 104612505.

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 505216401 - 2⁷ = 505216273 is a prime.

It is a super-2 number, since 2×505216401² = 510487223678785602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (505216451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84202731 + ... + 84202736.

It is an arithmetic number, because the mean of its divisors is an integer number (168405468).

Almost surely, 2^505216401 is an apocalyptic number.

It is an amenable number.

505216401 is a deficient number, since it is larger than the sum of its proper divisors (168405471).

505216401 is a wasteful number, since it uses less digits than its factorization.

505216401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168405470.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 505216401 is about 22477.0193975981. The cubic root of 505216401 is about 796.4511559318.

Adding to 505216401 its reverse (104612505), we get a palindrome (609828906).

The spelling of 505216401 in words is "five hundred five million, two hundred sixteen thousand, four hundred one".