51251544052213 has 4 divisors (see below), whose sum is σ = 51251740770240. Its totient is φ = 51251347334188.

The previous prime is 51251544052211. The next prime is 51251544052223. The reversal of 51251544052213 is 31225044515215.

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 51251544052213 - 2¹ = 51251544052211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51251544052211) 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, 97967695 + ... + 98489452.

It is an arithmetic number, because the mean of its divisors is an integer number (12812935192560).

Almost surely, 2^{51251544052213} is an apocalyptic number.

It is an amenable number.

51251544052213 is a deficient number, since it is larger than the sum of its proper divisors (196718027).

51251544052213 is a wasteful number, since it uses less digits than its factorization.

51251544052213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196718026.

The product of its (nonzero) digits is 240000, while the sum is 40.

Adding to 51251544052213 its reverse (31225044515215), we get a palindrome (82476588567428).

The spelling of 51251544052213 in words is "fifty-one trillion, two hundred fifty-one billion, five hundred forty-four million, fifty-two thousand, two hundred thirteen".