2081381 has 8 divisors (see below), whose sum is σ = 2139000. Its totient is φ = 2024640.

The previous prime is 2081377. The next prime is 2081383. The reversal of 2081381 is 1831802.

It can be written as a sum of positive squares in 4 ways, for example, as 36481 + 2044900 = 191^2 + 1430^2 .

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 2081381 - 2² = 2081377 is a prime.

It is a super-2 number, since 2×2081381² = 8664293734322, 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 (2081383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8975 + ... + 9203.

It is an arithmetic number, because the mean of its divisors is an integer number (267375).

2^2081381 is an apocalyptic number.

It is an amenable number.

2081381 is a deficient number, since it is larger than the sum of its proper divisors (57619).

2081381 is a wasteful number, since it uses less digits than its factorization.

2081381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 2081381 is about 1442.6992063490. The cubic root of 2081381 is about 127.6783304914.

The spelling of 2081381 in words is "two million, eighty-one thousand, three hundred eighty-one".