2102255861 has 2 divisors, whose sum is σ = 2102255862. Its totient is φ = 2102255860.

The previous prime is 2102255833. The next prime is 2102255891. The reversal of 2102255861 is 1685522012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1851666961 + 250588900 = 43031^2 + 15830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102255861 - 2²² = 2098061557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102255891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051127930 + 1051127931.

It is an arithmetic number, because the mean of its divisors is an integer number (1051127931).

Almost surely, 2^2102255861 is an apocalyptic number.

It is an amenable number.

2102255861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102255861 is an equidigital number, since it uses as much as digits as its factorization.

2102255861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 2102255861 is about 45850.3638044454. The cubic root of 2102255861 is about 1281.0375419411.

Adding to 2102255861 its reverse (1685522012), we get a palindrome (3787777873).

The spelling of 2102255861 in words is "two billion, one hundred two million, two hundred fifty-five thousand, eight hundred sixty-one".