1281651192439 has 2 divisors, whose sum is σ = 1281651192440. Its totient is φ = 1281651192438.

The previous prime is 1281651192379. The next prime is 1281651192457. The reversal of 1281651192439 is 9342911561821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1281651192439 - 2²⁷ = 1281516974711 is a prime.

It is a super-2 number, since 2×1281651192439² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281651192469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640825596219 + 640825596220.

It is an arithmetic number, because the mean of its divisors is an integer number (640825596220).

Almost surely, 2^{1281651192439} is an apocalyptic number.

1281651192439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281651192439 is an equidigital number, since it uses as much as digits as its factorization.

1281651192439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 52.

The spelling of 1281651192439 in words is "one trillion, two hundred eighty-one billion, six hundred fifty-one million, one hundred ninety-two thousand, four hundred thirty-nine".