655901 has 2 divisors, whose sum is σ = 655902. Its totient is φ = 655900.

The previous prime is 655883. The next prime is 655909. The reversal of 655901 is 109556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 592900 + 63001 = 770^2 + 251^2 .

It is a cyclic number.

It is not a de Polignac number, because 655901 - 2¹⁰ = 654877 is a prime.

It is a super-2 number, since 2×655901² = 860412243602, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655901.

It is not a weakly prime, because it can be changed into another prime (655909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327950 + 327951.

It is an arithmetic number, because the mean of its divisors is an integer number (327951).

2⁶⁵⁵⁹⁰¹ is an apocalyptic number.

It is an amenable number.

655901 is a deficient number, since it is larger than the sum of its proper divisors (1).

655901 is an equidigital number, since it uses as much as digits as its factorization.

655901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 655901 is about 809.8771511779. The cubic root of 655901 is about 86.8852585232.

The spelling of 655901 in words is "six hundred fifty-five thousand, nine hundred one".