2731381 has 2 divisors, whose sum is σ = 2731382. Its totient is φ = 2731380.

The previous prime is 2731367. The next prime is 2731427. The reversal of 2731381 is 1831372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2353156 + 378225 = 1534^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 2731381 - 2⁵ = 2731349 is a prime.

It is a super-2 number, since 2×2731381² = 14920884334322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2731331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365690 + 1365691.

It is an arithmetic number, because the mean of its divisors is an integer number (1365691).

2^2731381 is an apocalyptic number.

It is an amenable number.

2731381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2731381 is an equidigital number, since it uses as much as digits as its factorization.

2731381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 2731381 is about 1652.6890209595. The cubic root of 2731381 is about 139.7850613351.

Subtracting from 2731381 its reverse (1831372), we obtain a palindrome (900009).

The spelling of 2731381 in words is "two million, seven hundred thirty-one thousand, three hundred eighty-one".