10109381 has 4 divisors (see below), whose sum is σ = 10116012. Its totient is φ = 10102752.

The previous prime is 10109369. The next prime is 10109389. The reversal of 10109381 is 18390101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2353156 + 7756225 = 1534^2 + 2785^2 .

It is a cyclic number.

It is not a de Polignac number, because 10109381 - 2¹⁴ = 10092997 is a prime.

It is a super-2 number, since 2×10109381² = 204399168406322, 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 (10109389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251 + ... + 4503.

It is an arithmetic number, because the mean of its divisors is an integer number (2529003).

Almost surely, 2^10109381 is an apocalyptic number.

It is an amenable number.

10109381 is a deficient number, since it is larger than the sum of its proper divisors (6631).

10109381 is an equidigital number, since it uses as much as digits as its factorization.

10109381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 10109381 is about 3179.5252790314. The cubic root of 10109381 is about 216.2261363400.

Adding to 10109381 its reverse (18390101), we get a palindrome (28499482).

The spelling of 10109381 in words is "ten million, one hundred nine thousand, three hundred eighty-one".