655000001 has 2 divisors, whose sum is σ = 655000002. Its totient is φ = 655000000.

The previous prime is 654999991. The next prime is 655000007. The reversal of 655000001 is 100000556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630010000 + 24990001 = 25100^2 + 4999^2 .

It is a cyclic number.

It is not a de Polignac number, because 655000001 - 2²⁶ = 587891137 is a prime.

It is not a weakly prime, because it can be changed into another prime (655000007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327500000 + 327500001.

It is an arithmetic number, because the mean of its divisors is an integer number (327500001).

Almost surely, 2^655000001 is an apocalyptic number.

It is an amenable number.

655000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

655000001 is an equidigital number, since it uses as much as digits as its factorization.

655000001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 655000001 is about 25592.9678036761. The cubic root of 655000001 is about 868.4545607137.

Adding to 655000001 its reverse (100000556), we get a palindrome (755000557).

The spelling of 655000001 in words is "six hundred fifty-five million, one", and thus it is an aban number.