512612121 has 16 divisors (see below), whose sum is σ = 781446528. Its totient is φ = 292800000.

The previous prime is 512612099. The next prime is 512612129. The reversal of 512612121 is 121216215.

It is a de Polignac number, because none of the positive numbers 2^k-512612121 is a prime.

It is a super-2 number, since 2×512612121² = 525542373192237282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (512612129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80971 + ... + 87071.

It is an arithmetic number, because the mean of its divisors is an integer number (48840408).

Almost surely, 2^512612121 is an apocalyptic number.

It is an amenable number.

512612121 is a deficient number, since it is larger than the sum of its proper divisors (268834407).

512612121 is a wasteful number, since it uses less digits than its factorization.

512612121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10112.

The product of its digits is 240, while the sum is 21.

The square root of 512612121 is about 22640.9390485466. The cubic root of 512612121 is about 800.3186860530.

Adding to 512612121 its reverse (121216215), we get a palindrome (633828336).

The spelling of 512612121 in words is "five hundred twelve million, six hundred twelve thousand, one hundred twenty-one".