505721253 has 8 divisors (see below), whose sum is σ = 713959488. Its totient is φ = 317315264.

The previous prime is 505721221. The next prime is 505721267. The reversal of 505721253 is 352127505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505721253 - 2⁵ = 505721221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505721253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505721453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4958001 + ... + 4958102.

It is an arithmetic number, because the mean of its divisors is an integer number (89244936).

Almost surely, 2^505721253 is an apocalyptic number.

It is an amenable number.

505721253 is a deficient number, since it is larger than the sum of its proper divisors (208238235).

505721253 is a wasteful number, since it uses less digits than its factorization.

505721253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9916123.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 505721253 is about 22488.2469970427. The cubic root of 505721253 is about 796.7163598452.

Adding to 505721253 its reverse (352127505), we get a palindrome (857848758).

The spelling of 505721253 in words is "five hundred five million, seven hundred twenty-one thousand, two hundred fifty-three".