51154735551421 has 2 divisors, whose sum is σ = 51154735551422. Its totient is φ = 51154735551420.

The previous prime is 51154735551341. The next prime is 51154735551461. The reversal of 51154735551421 is 12415553745115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50481451300900 + 673284250521 = 7105030^2 + 820539^2 .

It is a cyclic number.

It is not a de Polignac number, because 51154735551421 - 2²⁹ = 51154198680509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51154735551461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25577367775710 + 25577367775711.

It is an arithmetic number, because the mean of its divisors is an integer number (25577367775711).

Almost surely, 2^{51154735551421} is an apocalyptic number.

It is an amenable number.

51154735551421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51154735551421 is an equidigital number, since it uses as much as digits as its factorization.

51154735551421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100000, while the sum is 49.

The spelling of 51154735551421 in words is "fifty-one trillion, one hundred fifty-four billion, seven hundred thirty-five million, five hundred fifty-one thousand, four hundred twenty-one".