1291877745671 has 2 divisors, whose sum is σ = 1291877745672. Its totient is φ = 1291877745670.

The previous prime is 1291877745647. The next prime is 1291877745689. The reversal of 1291877745671 is 1765477781921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291877745671 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291877745598 and 1291877745607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291877045671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645938872835 + 645938872836.

It is an arithmetic number, because the mean of its divisors is an integer number (645938872836).

Almost surely, 2^{1291877745671} is an apocalyptic number.

1291877745671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291877745671 is an equidigital number, since it uses as much as digits as its factorization.

1291877745671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41489280, while the sum is 65.

The spelling of 1291877745671 in words is "one trillion, two hundred ninety-one billion, eight hundred seventy-seven million, seven hundred forty-five thousand, six hundred seventy-one".