655081409 has 2 divisors, whose sum is σ = 655081410. Its totient is φ = 655081408.

The previous prime is 655081403. The next prime is 655081433. The reversal of 655081409 is 904180556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648466225 + 6615184 = 25465^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 655081409 - 2⁸ = 655081153 is a prime.

It is not a weakly prime, because it can be changed into another prime (655081403) 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 as a sum of consecutive naturals, namely, 327540704 + 327540705.

It is an arithmetic number, because the mean of its divisors is an integer number (327540705).

Almost surely, 2^655081409 is an apocalyptic number.

It is an amenable number.

655081409 is a deficient number, since it is larger than the sum of its proper divisors (1).

655081409 is an equidigital number, since it uses as much as digits as its factorization.

655081409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 655081409 is about 25594.5581911468. The cubic root of 655081409 is about 868.4905384338.

The spelling of 655081409 in words is "six hundred fifty-five million, eighty-one thousand, four hundred nine".