51512415121 has 4 divisors (see below), whose sum is σ = 51515474544. Its totient is φ = 51509355700.

The previous prime is 51512415091. The next prime is 51512415127. The reversal of 51512415121 is 12151421515.

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 not a de Polignac number, because 51512415121 - 2⁵ = 51512415089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51512415121.

It is not an unprimeable number, because it can be changed into a prime (51512415127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1504315 + ... + 1538176.

It is an arithmetic number, because the mean of its divisors is an integer number (12878868636).

Almost surely, 2^51512415121 is an apocalyptic number.

It is an amenable number.

51512415121 is a deficient number, since it is larger than the sum of its proper divisors (3059423).

51512415121 is a wasteful number, since it uses less digits than its factorization.

51512415121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059422.

The product of its digits is 2000, while the sum is 28.

Adding to 51512415121 its reverse (12151421515), we get a palindrome (63663836636).

The spelling of 51512415121 in words is "fifty-one billion, five hundred twelve million, four hundred fifteen thousand, one hundred twenty-one".