689939191819 has 2 divisors, whose sum is σ = 689939191820. Its totient is φ = 689939191818.

The previous prime is 689939191811. The next prime is 689939191859. The reversal of 689939191819 is 918191939986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689939191819 - 2³ = 689939191811 is a prime.

It is a super-2 number, since 2×689939191819² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (689939191811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344969595909 + 344969595910.

It is an arithmetic number, because the mean of its divisors is an integer number (344969595910).

Almost surely, 2^689939191819 is an apocalyptic number.

689939191819 is a deficient number, since it is larger than the sum of its proper divisors (1).

689939191819 is an equidigital number, since it uses as much as digits as its factorization.

689939191819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68024448, while the sum is 73.

The spelling of 689939191819 in words is "six hundred eighty-nine billion, nine hundred thirty-nine million, one hundred ninety-one thousand, eight hundred nineteen".