51544879249 has 2 divisors, whose sum is σ = 51544879250. Its totient is φ = 51544879248.

The previous prime is 51544879213. The next prime is 51544879259. The reversal of 51544879249 is 94297844515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37956780625 + 13588098624 = 194825^2 + 116568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51544879249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51544879193 and 51544879202.

It is not a weakly prime, because it can be changed into another prime (51544879259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25772439624 + 25772439625.

It is an arithmetic number, because the mean of its divisors is an integer number (25772439625).

Almost surely, 2^51544879249 is an apocalyptic number.

It is an amenable number.

51544879249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51544879249 is an equidigital number, since it uses as much as digits as its factorization.

51544879249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 58.

The spelling of 51544879249 in words is "fifty-one billion, five hundred forty-four million, eight hundred seventy-nine thousand, two hundred forty-nine".