655781287 has 6 divisors (see below), whose sum is σ = 749541768. Its totient is φ = 562040172.

The previous prime is 655781251. The next prime is 655781297. The reversal of 655781287 is 782187556.

It is not a de Polignac number, because 655781287 - 2¹⁹ = 655256999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655781287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655781227) 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 in 5 ways as a sum of consecutive naturals, for example, 62914 + ... + 72592.

It is an arithmetic number, because the mean of its divisors is an integer number (124923628).

Almost surely, 2^655781287 is an apocalyptic number.

655781287 is a deficient number, since it is larger than the sum of its proper divisors (93760481).

655781287 is an frugal number, since it uses more digits than its factorization.

655781287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19365 (or 9686 counting only the distinct ones).

The product of its digits is 940800, while the sum is 49.

The square root of 655781287 is about 25608.2269397942. The cubic root of 655781287 is about 868.7997219303.

The spelling of 655781287 in words is "six hundred fifty-five million, seven hundred eighty-one thousand, two hundred eighty-seven".