102855986309 has 2 divisors, whose sum is σ = 102855986310. Its totient is φ = 102855986308.

The previous prime is 102855986267. The next prime is 102855986341. The reversal of 102855986309 is 903689558201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53869017409 + 48986968900 = 232097^2 + 221330^2 .

It is a cyclic number.

It is not a de Polignac number, because 102855986309 - 2²⁴ = 102839209093 is a prime.

It is a Sophie Germain 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 (102855986399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51427993154 + 51427993155.

It is an arithmetic number, because the mean of its divisors is an integer number (51427993155).

Almost surely, 2^102855986309 is an apocalyptic number.

It is an amenable number.

102855986309 is a deficient number, since it is larger than the sum of its proper divisors (1).

102855986309 is an equidigital number, since it uses as much as digits as its factorization.

102855986309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 102855986309 in words is "one hundred two billion, eight hundred fifty-five million, nine hundred eighty-six thousand, three hundred nine".