505513251 has 16 divisors (see below), whose sum is σ = 781470720. Its totient is φ = 322355880.

The previous prime is 505513219. The next prime is 505513279. The reversal of 505513251 is 152315505.

It is not a de Polignac number, because 505513251 - 2⁵ = 505513219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (505513291) 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, 406395 + ... + 407636.

It is an arithmetic number, because the mean of its divisors is an integer number (48841920).

Almost surely, 2^505513251 is an apocalyptic number.

505513251 is a deficient number, since it is larger than the sum of its proper divisors (275957469).

505513251 is a wasteful number, since it uses less digits than its factorization.

505513251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814063 (or 814057 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 505513251 is about 22483.6218390187. The cubic root of 505513251 is about 796.6071156582.

Adding to 505513251 its reverse (152315505), we get a palindrome (657828756).

The spelling of 505513251 in words is "five hundred five million, five hundred thirteen thousand, two hundred fifty-one".