2861381 has 8 divisors (see below), whose sum is σ = 3054720. Its totient is φ = 2672352.

The previous prime is 2861377. The next prime is 2861387. The reversal of 2861381 is 1831682.

2861381 = 61² + 62² + ... + 206².

2861381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2861381 - 2² = 2861377 is a prime.

It is a super-2 number, since 2×2861381² = 16375002454322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861387) 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 7 ways as a sum of consecutive naturals, for example, 356 + ... + 2418.

It is an arithmetic number, because the mean of its divisors is an integer number (381840).

2^2861381 is an apocalyptic number.

It is an amenable number.

2861381 is a deficient number, since it is larger than the sum of its proper divisors (193339).

2861381 is a wasteful number, since it uses less digits than its factorization.

2861381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155.

The product of its digits is 2304, while the sum is 29.

The square root of 2861381 is about 1691.5617044613. The cubic root of 2861381 is about 141.9684681690.

The spelling of 2861381 in words is "two million, eight hundred sixty-one thousand, three hundred eighty-one".