1391591017 has 2 divisors, whose sum is σ = 1391591018. Its totient is φ = 1391591016.

The previous prime is 1391590957. The next prime is 1391591021. The reversal of 1391591017 is 7101951931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1391588416 + 2601 = 37304^2 + 51^2 .

It is an emirp because it is prime and its reverse (7101951931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1391591017 - 2²³ = 1383202409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391591417) 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, 695795508 + 695795509.

It is an arithmetic number, because the mean of its divisors is an integer number (695795509).

Almost surely, 2^1391591017 is an apocalyptic number.

It is an amenable number.

1391591017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391591017 is an equidigital number, since it uses as much as digits as its factorization.

1391591017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8505, while the sum is 37.

The square root of 1391591017 is about 37304.0348621969. The cubic root of 1391591017 is about 1116.4446721792. Note that the first 3 decimals are identical.

The spelling of 1391591017 in words is "one billion, three hundred ninety-one million, five hundred ninety-one thousand, seventeen".