2311381 has 2 divisors, whose sum is σ = 2311382. Its totient is φ = 2311380.

The previous prime is 2311363. The next prime is 2311409. The reversal of 2311381 is 1831132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2056356 + 255025 = 1434^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311381 - 2⁵ = 2311349 is a prime.

It is a super-2 number, since 2×2311381² = 10684964254322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2311321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155690 + 1155691.

It is an arithmetic number, because the mean of its divisors is an integer number (1155691).

2^2311381 is an apocalyptic number.

It is an amenable number.

2311381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311381 is an equidigital number, since it uses as much as digits as its factorization.

2311381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 2311381 is about 1520.3226631212. The cubic root of 2311381 is about 132.2179785324.

Subtracting from 2311381 its reverse (1831132), we obtain a square (480249 = 693²).

The spelling of 2311381 in words is "two million, three hundred eleven thousand, three hundred eighty-one".