100786981 has 2 divisors, whose sum is σ = 100786982. Its totient is φ = 100786980.

The previous prime is 100786967. The next prime is 100786993. The reversal of 100786981 is 189687001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81162081 + 19624900 = 9009^2 + 4430^2 .

It is a cyclic number.

It is not a de Polignac number, because 100786981 - 2⁵ = 100786949 is a prime.

It is a super-2 number, since 2×100786981² = 20316031078188722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100786381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50393490 + 50393491.

It is an arithmetic number, because the mean of its divisors is an integer number (50393491).

Almost surely, 2^100786981 is an apocalyptic number.

It is an amenable number.

100786981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100786981 is an equidigital number, since it uses as much as digits as its factorization.

100786981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 100786981 is about 10039.2719357531. The cubic root of 100786981 is about 465.3733171970.

The spelling of 100786981 in words is "one hundred million, seven hundred eighty-six thousand, nine hundred eighty-one".