1281367494787 has 2 divisors, whose sum is σ = 1281367494788. Its totient is φ = 1281367494786.

The previous prime is 1281367494767. The next prime is 1281367494793. The reversal of 1281367494787 is 7874947631821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1281367494787 - 2²³ = 1281359106179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281367494767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640683747393 + 640683747394.

It is an arithmetic number, because the mean of its divisors is an integer number (640683747394).

Almost surely, 2^{1281367494787} is an apocalyptic number.

1281367494787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281367494787 is an equidigital number, since it uses as much as digits as its factorization.

1281367494787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113799168, while the sum is 67.

The spelling of 1281367494787 in words is "one trillion, two hundred eighty-one billion, three hundred sixty-seven million, four hundred ninety-four thousand, seven hundred eighty-seven".