51154172369 has 2 divisors, whose sum is σ = 51154172370. Its totient is φ = 51154172368.

The previous prime is 51154172347. The next prime is 51154172401. The reversal of 51154172369 is 96327145115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40844410000 + 10309762369 = 202100^2 + 101537^2 .

It is a cyclic number.

It is not a de Polignac number, because 51154172369 - 2²⁰ = 51153123793 is a prime.

It is a super-2 number, since 2×51154172369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51154172669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25577086184 + 25577086185.

It is an arithmetic number, because the mean of its divisors is an integer number (25577086185).

Almost surely, 2^51154172369 is an apocalyptic number.

It is an amenable number.

51154172369 is a deficient number, since it is larger than the sum of its proper divisors (1).

51154172369 is an equidigital number, since it uses as much as digits as its factorization.

51154172369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The spelling of 51154172369 in words is "fifty-one billion, one hundred fifty-four million, one hundred seventy-two thousand, three hundred sixty-nine".