1391591041 has 4 divisors (see below), whose sum is σ = 1392050500. Its totient is φ = 1391131584.

The previous prime is 1391591021. The next prime is 1391591059. The reversal of 1391591041 is 1401951931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 869011441 + 522579600 = 29479^2 + 22860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391591041 - 2¹¹ = 1391588993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1391590988 and 1391591006.

It is not an unprimeable number, because it can be changed into a prime (1391591021) 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 in 3 ways as a sum of consecutive naturals, for example, 225156 + ... + 231253.

It is an arithmetic number, because the mean of its divisors is an integer number (348012625).

Almost surely, 2^1391591041 is an apocalyptic number.

It is an amenable number.

1391591041 is a deficient number, since it is larger than the sum of its proper divisors (459459).

1391591041 is an equidigital number, since it uses as much as digits as its factorization.

1391591041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459458.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 1391591041 is about 37304.0351838779. The cubic root of 1391591041 is about 1116.4446785974. Note that the first 3 decimals are identical.

The spelling of 1391591041 in words is "one billion, three hundred ninety-one million, five hundred ninety-one thousand, forty-one".