106871981 has 4 divisors (see below), whose sum is σ = 107973852. Its totient is φ = 105770112.

The previous prime is 106871977. The next prime is 106871983. The reversal of 106871981 is 189178601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79477225 + 27394756 = 8915^2 + 5234^2 .

It is a cyclic number.

It is not a de Polignac number, because 106871981 - 2² = 106871977 is a prime.

It is a super-2 number, since 2×106871981² = 22843240645728722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106871983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550790 + ... + 550983.

It is an arithmetic number, because the mean of its divisors is an integer number (26993463).

Almost surely, 2^106871981 is an apocalyptic number.

It is an amenable number.

106871981 is a deficient number, since it is larger than the sum of its proper divisors (1101871).

106871981 is an equidigital number, since it uses as much as digits as its factorization.

106871981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101870.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 106871981 is about 10337.8905488499. The cubic root of 106871981 is about 474.5565294004.

The spelling of 106871981 in words is "one hundred six million, eight hundred seventy-one thousand, nine hundred eighty-one".