687174889 has 2 divisors, whose sum is σ = 687174890. Its totient is φ = 687174888.

The previous prime is 687174791. The next prime is 687174893. The reversal of 687174889 is 988471786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489294400 + 197880489 = 22120^2 + 14067^2 .

It is a cyclic number.

It is not a de Polignac number, because 687174889 - 2¹⁵ = 687142121 is a prime.

It is not a weakly prime, because it can be changed into another prime (687174899) 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, 343587444 + 343587445.

It is an arithmetic number, because the mean of its divisors is an integer number (343587445).

Almost surely, 2^687174889 is an apocalyptic number.

It is an amenable number.

687174889 is a deficient number, since it is larger than the sum of its proper divisors (1).

687174889 is an equidigital number, since it uses as much as digits as its factorization.

687174889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5419008, while the sum is 58.

The square root of 687174889 is about 26214.0208476304. The cubic root of 687174889 is about 882.4479400684.

The spelling of 687174889 in words is "six hundred eighty-seven million, one hundred seventy-four thousand, eight hundred eighty-nine".