505612121 has 4 divisors (see below), whose sum is σ = 577842432. Its totient is φ = 433381812.

The previous prime is 505612111. The next prime is 505612127. The reversal of 505612121 is 121216505.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121216505 = 5 ⋅24243301.

It is a cyclic number.

It is not a de Polignac number, because 505612121 - 2⁶ = 505612057 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505612127) 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, 36115145 + ... + 36115158.

It is an arithmetic number, because the mean of its divisors is an integer number (144460608).

Almost surely, 2^505612121 is an apocalyptic number.

It is an amenable number.

505612121 is a deficient number, since it is larger than the sum of its proper divisors (72230311).

505612121 is an equidigital number, since it uses as much as digits as its factorization.

505612121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72230310.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 505612121 is about 22485.8204431148. The cubic root of 505612121 is about 796.6590466486.

Adding to 505612121 its reverse (121216505), we get a palindrome (626828626).

The spelling of 505612121 in words is "five hundred five million, six hundred twelve thousand, one hundred twenty-one".