105855391489 has 2 divisors, whose sum is σ = 105855391490. Its totient is φ = 105855391488.

The previous prime is 105855391487. The next prime is 105855391501. The reversal of 105855391489 is 984193558501.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95377821889 + 10477569600 = 308833^2 + 102360^2 .

It is a cyclic number.

It is not a de Polignac number, because 105855391489 - 2¹ = 105855391487 is a prime.

It is a super-2 number, since 2×105855391489² (a number of 23 digits) contains 22 as substring.

Together with 105855391487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (105855391487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52927695744 + 52927695745.

It is an arithmetic number, because the mean of its divisors is an integer number (52927695745).

Almost surely, 2^105855391489 is an apocalyptic number.

It is an amenable number.

105855391489 is a deficient number, since it is larger than the sum of its proper divisors (1).

105855391489 is an equidigital number, since it uses as much as digits as its factorization.

105855391489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776000, while the sum is 58.

The spelling of 105855391489 in words is "one hundred five billion, eight hundred fifty-five million, three hundred ninety-one thousand, four hundred eighty-nine".