505142251 has 4 divisors (see below), whose sum is σ = 506590000. Its totient is φ = 503694504.

The previous prime is 505142237. The next prime is 505142257. The reversal of 505142251 is 152241505.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 505142251 - 2⁹ = 505141739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505142257) 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, 723351 + ... + 724048.

It is an arithmetic number, because the mean of its divisors is an integer number (126647500).

Almost surely, 2^505142251 is an apocalyptic number.

505142251 is a deficient number, since it is larger than the sum of its proper divisors (1447749).

505142251 is a wasteful number, since it uses less digits than its factorization.

505142251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447748.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 505142251 is about 22475.3698745983. The cubic root of 505142251 is about 796.4121893012.

Adding to 505142251 its reverse (152241505), we get a palindrome (657383756).

The spelling of 505142251 in words is "five hundred five million, one hundred forty-two thousand, two hundred fifty-one".