100866989 has 2 divisors, whose sum is σ = 100866990. Its totient is φ = 100866988.

The previous prime is 100866923. The next prime is 100867009. The reversal of 100866989 is 989668001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93276964 + 7590025 = 9658^2 + 2755^2 .

It is a cyclic number.

It is not a de Polignac number, because 100866989 - 2¹⁶ = 100801453 is a prime.

It is a super-2 number, since 2×100866989² = 20348298939852242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (100866919) 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, 50433494 + 50433495.

It is an arithmetic number, because the mean of its divisors is an integer number (50433495).

Almost surely, 2^100866989 is an apocalyptic number.

It is an amenable number.

100866989 is a deficient number, since it is larger than the sum of its proper divisors (1).

100866989 is an equidigital number, since it uses as much as digits as its factorization.

100866989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 100866989 is about 10043.2558963715. The cubic root of 100866989 is about 465.4964274768.

The spelling of 100866989 in words is "one hundred million, eight hundred sixty-six thousand, nine hundred eighty-nine".