2071381 has 4 divisors (see below), whose sum is σ = 2230732. Its totient is φ = 1912032.

The previous prime is 2071379. The next prime is 2071393. The reversal of 2071381 is 1831702.

2071381 = T₅₅₈ + T₅₅₉ + ... + T₅₇₀.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1831702 = 2 ⋅915851.

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 1199025 = 934^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 2071381 - 2¹ = 2071379 is a prime.

It is a super-2 number, since 2×2071381² = 8581238494322, 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 (2071351) 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, 79656 + ... + 79681.

It is an arithmetic number, because the mean of its divisors is an integer number (557683).

2^2071381 is an apocalyptic number.

It is an amenable number.

2071381 is a deficient number, since it is larger than the sum of its proper divisors (159351).

2071381 is a wasteful number, since it uses less digits than its factorization.

2071381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159350.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 2071381 is about 1439.2293076505. The cubic root of 2071381 is about 127.4735251963.

The spelling of 2071381 in words is "two million, seventy-one thousand, three hundred eighty-one".