689018377 has 2 divisors, whose sum is σ = 689018378. Its totient is φ = 689018376.

The previous prime is 689018357. The next prime is 689018389. The reversal of 689018377 is 773810986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687698176 + 1320201 = 26224^2 + 1149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689018377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689018377.

It is not a weakly prime, because it can be changed into another prime (689018357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344509188 + 344509189.

It is an arithmetic number, because the mean of its divisors is an integer number (344509189).

Almost surely, 2^689018377 is an apocalyptic number.

It is an amenable number.

689018377 is a deficient number, since it is larger than the sum of its proper divisors (1).

689018377 is an equidigital number, since it uses as much as digits as its factorization.

689018377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 689018377 is about 26249.1595484503. The cubic root of 689018377 is about 883.2363515061.

The spelling of 689018377 in words is "six hundred eighty-nine million, eighteen thousand, three hundred seventy-seven".