10391881 has 4 divisors (see below), whose sum is σ = 10402452. Its totient is φ = 10381312.

The previous prime is 10391873. The next prime is 10391893. The reversal of 10391881 is 18819301.

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 7209225 + 3182656 = 2685^2 + 1784^2 .

It is a cyclic number.

It is not a de Polignac number, because 10391881 - 2³ = 10391873 is a prime.

It is a super-2 number, since 2×10391881² = 215982381436322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10361881) 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 in 3 ways as a sum of consecutive naturals, for example, 3640 + ... + 5833.

It is an arithmetic number, because the mean of its divisors is an integer number (2600613).

Almost surely, 2^10391881 is an apocalyptic number.

It is an amenable number.

10391881 is a deficient number, since it is larger than the sum of its proper divisors (10571).

10391881 is an equidigital number, since it uses as much as digits as its factorization.

10391881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 10391881 is about 3223.6440560335. The cubic root of 10391881 is about 218.2217604220.

The spelling of 10391881 in words is "ten million, three hundred ninety-one thousand, eight hundred eighty-one".