689939191391 has 2 divisors, whose sum is σ = 689939191392. Its totient is φ = 689939191390.

The previous prime is 689939191373. The next prime is 689939191453. The reversal of 689939191391 is 193191939986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689939191391 - 2¹⁴ = 689939175007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689939191351) 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, 344969595695 + 344969595696.

It is an arithmetic number, because the mean of its divisors is an integer number (344969595696).

Almost surely, 2^689939191391 is an apocalyptic number.

689939191391 is a deficient number, since it is larger than the sum of its proper divisors (1).

689939191391 is an equidigital number, since it uses as much as digits as its factorization.

689939191391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25509168, while the sum is 68.

The spelling of 689939191391 in words is "six hundred eighty-nine billion, nine hundred thirty-nine million, one hundred ninety-one thousand, three hundred ninety-one".