512121 has 4 divisors (see below), whose sum is σ = 682832. Its totient is φ = 341412.

The previous prime is 512101. The next prime is 512137. The reversal of 512121 is 121215.

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 not a de Polignac number, because 512121 - 2¹¹ = 510073 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 512097 and 512106.

It is not an unprimeable number, because it can be changed into a prime (512101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85351 + ... + 85356.

It is an arithmetic number, because the mean of its divisors is an integer number (170708).

2⁵¹²¹²¹ is an apocalyptic number.

It is an amenable number.

512121 is a deficient number, since it is larger than the sum of its proper divisors (170711).

512121 is a wasteful number, since it uses less digits than its factorization.

512121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170710.

The product of its digits is 20, while the sum is 12.

The square root of 512121 is about 715.6262991255. The cubic root of 512121 is about 80.0063015869.

Adding to 512121 its reverse (121215), we get a palindrome (633336).

The spelling of 512121 in words is "five hundred twelve thousand, one hundred twenty-one".