1391563 has 2 divisors, whose sum is σ = 1391564. Its totient is φ = 1391562.

The previous prime is 1391561. The next prime is 1391567. The reversal of 1391563 is 3651931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1391563 - 2¹ = 1391561 is a prime.

Together with 1391561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1391561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695781 + 695782.

It is an arithmetic number, because the mean of its divisors is an integer number (695782).

2^1391563 is an apocalyptic number.

1391563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391563 is an equidigital number, since it uses as much as digits as its factorization.

1391563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 28.

The square root of 1391563 is about 1179.6452856685. The cubic root of 1391563 is about 111.6437179642.

The spelling of 1391563 in words is "one million, three hundred ninety-one thousand, five hundred sixty-three".