105395989 has 2 divisors, whose sum is σ = 105395990. Its totient is φ = 105395988.

The previous prime is 105395987. The next prime is 105396041. The reversal of 105395989 is 989593501.

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., 80245764 + 25150225 = 8958^2 + 5015^2 .

It is a cyclic number.

It is not a de Polignac number, because 105395989 - 2¹ = 105395987 is a prime.

It is a super-2 number, since 2×105395989² = 22216628994576242, which contains 22 as substring.

Together with 105395987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105395981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52697994 + 52697995.

It is an arithmetic number, because the mean of its divisors is an integer number (52697995).

Almost surely, 2^105395989 is an apocalyptic number.

It is an amenable number.

105395989 is a deficient number, since it is larger than the sum of its proper divisors (1).

105395989 is an equidigital number, since it uses as much as digits as its factorization.

105395989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 437400, while the sum is 49.

The square root of 105395989 is about 10266.2548672824. The cubic root of 105395989 is about 472.3617190975.

The spelling of 105395989 in words is "one hundred five million, three hundred ninety-five thousand, nine hundred eighty-nine".