655544129 has 2 divisors, whose sum is σ = 655544130. Its totient is φ = 655544128.

The previous prime is 655544111. The next prime is 655544233. The reversal of 655544129 is 921445556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388287025 + 267257104 = 19705^2 + 16348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655544129 is a prime.

It is not a weakly prime, because it can be changed into another prime (655544629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327772064 + 327772065.

It is an arithmetic number, because the mean of its divisors is an integer number (327772065).

Almost surely, 2^655544129 is an apocalyptic number.

It is an amenable number.

655544129 is a deficient number, since it is larger than the sum of its proper divisors (1).

655544129 is an equidigital number, since it uses as much as digits as its factorization.

655544129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 41.

The square root of 655544129 is about 25603.5960169661. The cubic root of 655544129 is about 868.6949778378.

The spelling of 655544129 in words is "six hundred fifty-five million, five hundred forty-four thousand, one hundred twenty-nine".