655391017 has 2 divisors, whose sum is σ = 655391018. Its totient is φ = 655391016.

The previous prime is 655390969. The next prime is 655391029. The reversal of 655391017 is 710193556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 651474576 + 3916441 = 25524^2 + 1979^2 .

It is a cyclic number.

It is not a de Polignac number, because 655391017 - 2²³ = 647002409 is a prime.

It is not a weakly prime, because it can be changed into another prime (655391047) 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, 327695508 + 327695509.

It is an arithmetic number, because the mean of its divisors is an integer number (327695509).

Almost surely, 2^655391017 is an apocalyptic number.

It is an amenable number.

655391017 is a deficient number, since it is larger than the sum of its proper divisors (1).

655391017 is an equidigital number, since it uses as much as digits as its factorization.

655391017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 655391017 is about 25600.6057936136. The cubic root of 655391017 is about 868.6273403968.

The spelling of 655391017 in words is "six hundred fifty-five million, three hundred ninety-one thousand, seventeen".