105071981 has 8 divisors (see below), whose sum is σ = 125303424. Its totient is φ = 86145840.

The previous prime is 105071963. The next prime is 105071983. The reversal of 105071981 is 189170501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 105071981 - 2¹⁰ = 105070957 is a prime.

It is a super-2 number, since 2×105071981² = 22080242382528722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105071983) 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 in 7 ways as a sum of consecutive naturals, for example, 326150 + ... + 326471.

It is an arithmetic number, because the mean of its divisors is an integer number (15662928).

Almost surely, 2^105071981 is an apocalyptic number.

It is an amenable number.

105071981 is a deficient number, since it is larger than the sum of its proper divisors (20231443).

105071981 is an equidigital number, since it uses as much as digits as its factorization.

105071981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652651.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 105071981 is about 10250.4624773714. The cubic root of 105071981 is about 471.8771779558.

The spelling of 105071981 in words is "one hundred five million, seventy-one thousand, nine hundred eighty-one".