3686991391 has 2 divisors, whose sum is σ = 3686991392. Its totient is φ = 3686991390.

The previous prime is 3686991349. The next prime is 3686991409. The reversal of 3686991391 is 1931996863.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3686991391 - 2¹³ = 3686983199 is a prime.

It is a super-2 number, since 2×3686991391² = 27187811034616229762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3686991491) 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, 1843495695 + 1843495696.

It is an arithmetic number, because the mean of its divisors is an integer number (1843495696).

Almost surely, 2^3686991391 is an apocalyptic number.

3686991391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3686991391 is an equidigital number, since it uses as much as digits as its factorization.

3686991391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 55.

The square root of 3686991391 is about 60720.6010428092. The cubic root of 3686991391 is about 1544.8656182628.

The spelling of 3686991391 in words is "three billion, six hundred eighty-six million, nine hundred ninety-one thousand, three hundred ninety-one".