1391119087 has 2 divisors, whose sum is σ = 1391119088.
Its totient is φ = 1391119086.
The previous prime is 1391119073. The next prime is 1391119111. The reversal of 1391119087 is 7809111931.
It is a weak prime.
It is an emirp because it is prime and its reverse (7809111931) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1391119087 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1391119987) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695559543 + 695559544.
It is an arithmetic number, because the mean of its divisors is an integer number (695559544).
Almost surely, 21391119087 is an apocalyptic number.
1391119087 is a deficient number, since it is larger than the sum of its proper divisors (1).
1391119087 is an equidigital number, since it uses as much as digits as its factorization.
1391119087 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 13608, while the sum is 40.
The square root of 1391119087 is about 37297.7088706532.
The cubic root of 1391119087 is about 1116.3184513524.
The spelling of 1391119087 in words is "one billion, three hundred ninety-one million, one hundred nineteen thousand, eighty-seven".