655519897 has 2 divisors, whose sum is σ = 655519898. Its totient is φ = 655519896.

The previous prime is 655519871. The next prime is 655519903. The reversal of 655519897 is 798915556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509134096 + 146385801 = 22564^2 + 12099^2 .

It is a cyclic number.

It is not a de Polignac number, because 655519897 - 2¹⁹ = 654995609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655519867) 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 as a sum of consecutive naturals, namely, 327759948 + 327759949.

It is an arithmetic number, because the mean of its divisors is an integer number (327759949).

Almost surely, 2^655519897 is an apocalyptic number.

It is an amenable number.

655519897 is a deficient number, since it is larger than the sum of its proper divisors (1).

655519897 is an equidigital number, since it uses as much as digits as its factorization.

655519897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402000, while the sum is 55.

The square root of 655519897 is about 25603.1227978151. The cubic root of 655519897 is about 868.6842740193.

The spelling of 655519897 in words is "six hundred fifty-five million, five hundred nineteen thousand, eight hundred ninety-seven".