1281431173249 has 2 divisors, whose sum is σ = 1281431173250. Its totient is φ = 1281431173248.

The previous prime is 1281431173241. The next prime is 1281431173313. The reversal of 1281431173249 is 9423711341821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972481961025 + 308949212224 = 986145^2 + 555832^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281431173249 - 2³ = 1281431173241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1281431173199 and 1281431173208.

It is not a weakly prime, because it can be changed into another prime (1281431173241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640715586624 + 640715586625.

It is an arithmetic number, because the mean of its divisors is an integer number (640715586625).

Almost surely, 2^{1281431173249} is an apocalyptic number.

It is an amenable number.

1281431173249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281431173249 is an equidigital number, since it uses as much as digits as its factorization.

1281431173249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The spelling of 1281431173249 in words is "one trillion, two hundred eighty-one billion, four hundred thirty-one million, one hundred seventy-three thousand, two hundred forty-nine".