10831981 has 4 divisors (see below), whose sum is σ = 11036412. Its totient is φ = 10627552.

The previous prime is 10831969. The next prime is 10832023. The reversal of 10831981 is 18913801.

10831981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18913801 = 4349².

It can be written as a sum of positive squares in 2 ways, for example, as 4536900 + 6295081 = 2130^2 + 2509^2 .

It is a cyclic number.

It is not a de Polignac number, because 10831981 - 2¹³ = 10823789 is a prime.

It is a super-2 number, since 2×10831981² = 234663624768722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10831081) 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, 102136 + ... + 102241.

It is an arithmetic number, because the mean of its divisors is an integer number (2759103).

Almost surely, 2^10831981 is an apocalyptic number.

It is an amenable number.

10831981 is a deficient number, since it is larger than the sum of its proper divisors (204431).

10831981 is an equidigital number, since it uses as much as digits as its factorization.

10831981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204430.

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

The square root of 10831981 is about 3291.1975024298. The cubic root of 10831981 is about 221.2598582646.

The spelling of 10831981 in words is "ten million, eight hundred thirty-one thousand, nine hundred eighty-one".