51810401813 has 2 divisors, whose sum is σ = 51810401814. Its totient is φ = 51810401812.

The previous prime is 51810401767. The next prime is 51810401827. The reversal of 51810401813 is 31810401815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30164047684 + 21646354129 = 173678^2 + 147127^2 .

It is a cyclic number.

It is not a de Polignac number, because 51810401813 - 2⁸ = 51810401557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51810401813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51810401843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25905200906 + 25905200907.

It is an arithmetic number, because the mean of its divisors is an integer number (25905200907).

Almost surely, 2^51810401813 is an apocalyptic number.

It is an amenable number.

51810401813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51810401813 is an equidigital number, since it uses as much as digits as its factorization.

51810401813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 32.

The spelling of 51810401813 in words is "fifty-one billion, eight hundred ten million, four hundred one thousand, eight hundred thirteen".