51211645125049 has 2 divisors, whose sum is σ = 51211645125050. Its totient is φ = 51211645125048.

The previous prime is 51211645125031. The next prime is 51211645125059. The reversal of 51211645125049 is 94052154611215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37064778967225 + 14146866157824 = 6088085^2 + 3761232^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51211645125049 is a prime.

It is not a weakly prime, because it can be changed into another prime (51211645125059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25605822562524 + 25605822562525.

It is an arithmetic number, because the mean of its divisors is an integer number (25605822562525).

Almost surely, 2^{51211645125049} is an apocalyptic number.

It is an amenable number.

51211645125049 is a deficient number, since it is larger than the sum of its proper divisors (1).

51211645125049 is an equidigital number, since it uses as much as digits as its factorization.

51211645125049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 51211645125049 in words is "fifty-one trillion, two hundred eleven billion, six hundred forty-five million, one hundred twenty-five thousand, forty-nine".