1391286667 has 2 divisors, whose sum is σ = 1391286668. Its totient is φ = 1391286666.

The previous prime is 1391286601. The next prime is 1391286697. The reversal of 1391286667 is 7666821931.

It is a strong prime.

It is an emirp because it is prime and its reverse (7666821931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391286667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1391286667.

It is not a weakly prime, because it can be changed into another prime (1391286697) 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, 695643333 + 695643334.

It is an arithmetic number, because the mean of its divisors is an integer number (695643334).

Almost surely, 2^1391286667 is an apocalyptic number.

1391286667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391286667 is an equidigital number, since it uses as much as digits as its factorization.

1391286667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 1391286667 is about 37299.9553216891. The cubic root of 1391286667 is about 1116.3632750095.

The spelling of 1391286667 in words is "one billion, three hundred ninety-one million, two hundred eighty-six thousand, six hundred sixty-seven".