51212615202313 has 4 divisors (see below), whose sum is σ = 51213165359488. Its totient is φ = 51212065045140.

The previous prime is 51212615202277. The next prime is 51212615202361. The reversal of 51212615202313 is 31320251621215.

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-51212615202313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51212615205313) 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, 274938933 + ... + 275125138.

It is an arithmetic number, because the mean of its divisors is an integer number (12803291339872).

Almost surely, 2^{51212615202313} is an apocalyptic number.

It is an amenable number.

51212615202313 is a deficient number, since it is larger than the sum of its proper divisors (550157175).

51212615202313 is an equidigital number, since it uses as much as digits as its factorization.

51212615202313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550157174.

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 51212615202313 its reverse (31320251621215), we get a palindrome (82532866823528).

The spelling of 51212615202313 in words is "fifty-one trillion, two hundred twelve billion, six hundred fifteen million, two hundred two thousand, three hundred thirteen".