1391889341 has 2 divisors, whose sum is σ = 1391889342. Its totient is φ = 1391889340.

The previous prime is 1391889313. The next prime is 1391889353. The reversal of 1391889341 is 1439881931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1295280100 + 96609241 = 35990^2 + 9829^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391889341 - 2¹⁰ = 1391888317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391888341) 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, 695944670 + 695944671.

It is an arithmetic number, because the mean of its divisors is an integer number (695944671).

Almost surely, 2^1391889341 is an apocalyptic number.

It is an amenable number.

1391889341 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391889341 is an equidigital number, since it uses as much as digits as its factorization.

1391889341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 47.

The square root of 1391889341 is about 37308.0331966187. The cubic root of 1391889341 is about 1116.5244462026.

The spelling of 1391889341 in words is "one billion, three hundred ninety-one million, eight hundred eighty-nine thousand, three hundred forty-one".