687153317 has 4 divisors (see below), whose sum is σ = 703913196. Its totient is φ = 670393440.

The previous prime is 687153241. The next prime is 687153319. The reversal of 687153317 is 713351786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 241056676 + 446096641 = 15526^2 + 21121^2 .

It is a cyclic number.

It is not a de Polignac number, because 687153317 - 2¹⁶ = 687087781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 16759837 = 687153317 / (6 + 8 + 7 + 1 + 5 + 3 + 3 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687153319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8379878 + ... + 8379959.

It is an arithmetic number, because the mean of its divisors is an integer number (175978299).

Almost surely, 2^687153317 is an apocalyptic number.

It is an amenable number.

687153317 is a deficient number, since it is larger than the sum of its proper divisors (16759879).

687153317 is a wasteful number, since it uses less digits than its factorization.

687153317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16759878.

The product of its digits is 105840, while the sum is 41.

The square root of 687153317 is about 26213.6093852029. The cubic root of 687153317 is about 882.4387059484.

The spelling of 687153317 in words is "six hundred eighty-seven million, one hundred fifty-three thousand, three hundred seventeen".