1081381 has 12 divisors (see below), whose sum is σ = 1303020. Its totient is φ = 893760.

The previous prime is 1081369. The next prime is 1081403. The reversal of 1081381 is 1831801.

It can be written as a sum of positive squares in 2 ways, for example, as 188356 + 893025 = 434^2 + 945^2 .

It is not a de Polignac number, because 1081381 - 2¹⁵ = 1048613 is a prime.

It is a super-2 number, since 2×1081381² = 2338769734322, which contains 22 as substring.

It is an Ulam 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 (1081331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1041 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (108585).

2^1081381 is an apocalyptic number.

It is an amenable number.

1081381 is a deficient number, since it is larger than the sum of its proper divisors (221639).

1081381 is an equidigital number, since it uses as much as digits as its factorization.

1081381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 1081381 is about 1039.8947062083. The cubic root of 1081381 is about 102.6422692257.

The spelling of 1081381 in words is "one million, eighty-one thousand, three hundred eighty-one".