51857132451121 has 2 divisors, whose sum is σ = 51857132451122. Its totient is φ = 51857132451120.

The previous prime is 51857132451119. The next prime is 51857132451181. The reversal of 51857132451121 is 12115423175815.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27192887502400 + 24664244948721 = 5214680^2 + 4966311^2 .

It is a cyclic number.

It is not a de Polignac number, because 51857132451121 - 2¹ = 51857132451119 is a prime.

Together with 51857132451119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51857132451181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25928566225560 + 25928566225561.

It is an arithmetic number, because the mean of its divisors is an integer number (25928566225561).

Almost surely, 2^{51857132451121} is an apocalyptic number.

It is an amenable number.

51857132451121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51857132451121 is an equidigital number, since it uses as much as digits as its factorization.

51857132451121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336000, while the sum is 46.

The spelling of 51857132451121 in words is "fifty-one trillion, eight hundred fifty-seven billion, one hundred thirty-two million, four hundred fifty-one thousand, one hundred twenty-one".