1391141678987 has 2 divisors, whose sum is σ = 1391141678988. Its totient is φ = 1391141678986.

The previous prime is 1391141678963. The next prime is 1391141678989. The reversal of 1391141678987 is 7898761411931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391141678987 is a prime.

Together with 1391141678989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1391141678989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695570839493 + 695570839494.

It is an arithmetic number, because the mean of its divisors is an integer number (695570839494).

Almost surely, 2^{1391141678987} is an apocalyptic number.

1391141678987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391141678987 is an equidigital number, since it uses as much as digits as its factorization.

1391141678987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 65.

The spelling of 1391141678987 in words is "one trillion, three hundred ninety-one billion, one hundred forty-one million, six hundred seventy-eight thousand, nine hundred eighty-seven".