51020555401 has 2 divisors, whose sum is σ = 51020555402. Its totient is φ = 51020555400.

The previous prime is 51020555359. The next prime is 51020555419. The reversal of 51020555401 is 10455502015.

51020555401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45688635001 + 5331920400 = 213749^2 + 73020^2 .

It is a cyclic number.

It is not a de Polignac number, because 51020555401 - 2⁹ = 51020554889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51020555401.

It is not a weakly prime, because it can be changed into another prime (51020555491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510277700 + 25510277701.

It is an arithmetic number, because the mean of its divisors is an integer number (25510277701).

Almost surely, 2^51020555401 is an apocalyptic number.

It is an amenable number.

51020555401 is a deficient number, since it is larger than the sum of its proper divisors (1).

51020555401 is an equidigital number, since it uses as much as digits as its factorization.

51020555401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 51020555401 in words is "fifty-one billion, twenty million, five hundred fifty-five thousand, four hundred one".