106321681 has 2 divisors, whose sum is σ = 106321682. Its totient is φ = 106321680.

The previous prime is 106321673. The next prime is 106321703. The reversal of 106321681 is 186123601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95726656 + 10595025 = 9784^2 + 3255^2 .

It is a cyclic number.

It is not a de Polignac number, because 106321681 - 2³ = 106321673 is a prime.

It is a super-2 number, since 2×106321681² = 22608599701331522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (106321181) 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, 53160840 + 53160841.

It is an arithmetic number, because the mean of its divisors is an integer number (53160841).

Almost surely, 2^106321681 is an apocalyptic number.

It is an amenable number.

106321681 is a deficient number, since it is larger than the sum of its proper divisors (1).

106321681 is an equidigital number, since it uses as much as digits as its factorization.

106321681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 106321681 is about 10311.2405170280. The cubic root of 106321681 is about 473.7406062330.

The spelling of 106321681 in words is "one hundred six million, three hundred twenty-one thousand, six hundred eighty-one".