1391118647 has 2 divisors, whose sum is σ = 1391118648. Its totient is φ = 1391118646.

The previous prime is 1391118629. The next prime is 1391118731. The reversal of 1391118647 is 7468111931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391118647 is a prime.

It is a super-2 number, since 2×1391118647² = 3870422180062221218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391118607) 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, 695559323 + 695559324.

It is an arithmetic number, because the mean of its divisors is an integer number (695559324).

Almost surely, 2^1391118647 is an apocalyptic number.

1391118647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391118647 is an equidigital number, since it uses as much as digits as its factorization.

1391118647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 1391118647 is about 37297.7029721671. The cubic root of 1391118647 is about 1116.3183336582.

The spelling of 1391118647 in words is "one billion, three hundred ninety-one million, one hundred eighteen thousand, six hundred forty-seven".