505758121 has 4 divisors (see below), whose sum is σ = 551736144. Its totient is φ = 459780100.

The previous prime is 505758107. The next prime is 505758133. The reversal of 505758121 is 121857505.

505758121 is nontrivially palindromic in base 12.

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 a de Polignac number, because none of the positive numbers 2^k-505758121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505758151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22988995 + ... + 22989016.

It is an arithmetic number, because the mean of its divisors is an integer number (137934036).

Almost surely, 2^505758121 is an apocalyptic number.

It is an amenable number.

505758121 is a deficient number, since it is larger than the sum of its proper divisors (45978023).

505758121 is a wasteful number, since it uses less digits than its factorization.

505758121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45978022.

The product of its (nonzero) digits is 14000, while the sum is 34.

The square root of 505758121 is about 22489.0666991763. The cubic root of 505758121 is about 796.7357200657.

The spelling of 505758121 in words is "five hundred five million, seven hundred fifty-eight thousand, one hundred twenty-one".