1391669563 has 2 divisors, whose sum is σ = 1391669564. Its totient is φ = 1391669562.

The previous prime is 1391669491. The next prime is 1391669627. The reversal of 1391669563 is 3659661931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1391669563 - 2¹³ = 1391661371 is a prime.

It is a super-2 number, since 2×1391669563² = 3873488345161221938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1391769563) 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, 695834781 + 695834782.

It is an arithmetic number, because the mean of its divisors is an integer number (695834782).

Almost surely, 2^1391669563 is an apocalyptic number.

1391669563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391669563 is an equidigital number, since it uses as much as digits as its factorization.

1391669563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 787320, while the sum is 49.

The square root of 1391669563 is about 37305.0876289012. The cubic root of 1391669563 is about 1116.4656770607.

The spelling of 1391669563 in words is "one billion, three hundred ninety-one million, six hundred sixty-nine thousand, five hundred sixty-three".