2851381 has 8 divisors (see below), whose sum is σ = 3095064. Its totient is φ = 2611200.

The previous prime is 2851361. The next prime is 2851391. The reversal of 2851381 is 1831582.

It can be written as a sum of positive squares in 4 ways, for example, as 933156 + 1918225 = 966^2 + 1385^2 .

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 2851381 - 2⁷ = 2851253 is a prime.

It is a super-2 number, since 2×2851381² = 16260747214322, 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 (2851351) 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, 981 + ... + 2581.

It is an arithmetic number, because the mean of its divisors is an integer number (386883).

2^2851381 is an apocalyptic number.

It is an amenable number.

2851381 is a deficient number, since it is larger than the sum of its proper divisors (243683).

2851381 is a wasteful number, since it uses less digits than its factorization.

2851381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751.

The product of its digits is 1920, while the sum is 28.

The square root of 2851381 is about 1688.6032689771. The cubic root of 2851381 is about 141.8028905748.

The spelling of 2851381 in words is "two million, eight hundred fifty-one thousand, three hundred eighty-one".