105218987 has 2 divisors, whose sum is σ = 105218988. Its totient is φ = 105218986.

The previous prime is 105218983. The next prime is 105218999. The reversal of 105218987 is 789812501.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 105218987 - 2² = 105218983 is a prime.

It is a super-2 number, since 2×105218987² = 22142070450612338, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (105218983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52609493 + 52609494.

It is an arithmetic number, because the mean of its divisors is an integer number (52609494).

Almost surely, 2^105218987 is an apocalyptic number.

105218987 is a deficient number, since it is larger than the sum of its proper divisors (1).

105218987 is an equidigital number, since it uses as much as digits as its factorization.

105218987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 105218987 is about 10257.6306718462. The cubic root of 105218987 is about 472.0971428778.

The spelling of 105218987 in words is "one hundred five million, two hundred eighteen thousand, nine hundred eighty-seven".