655112021 has 2 divisors, whose sum is σ = 655112022. Its totient is φ = 655112020.

The previous prime is 655112011. The next prime is 655112053. The reversal of 655112021 is 120211556.

It is a happy number.

655112021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432057796 + 223054225 = 20786^2 + 14935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655112021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655112011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327556010 + 327556011.

It is an arithmetic number, because the mean of its divisors is an integer number (327556011).

Almost surely, 2^655112021 is an apocalyptic number.

It is an amenable number.

655112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

655112021 is an equidigital number, since it uses as much as digits as its factorization.

655112021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 655112021 is about 25595.1562019066. The cubic root of 655112021 is about 868.5040664309.

Adding to 655112021 its reverse (120211556), we get a palindrome (775323577).

The spelling of 655112021 in words is "six hundred fifty-five million, one hundred twelve thousand, twenty-one".