2287381 has 2 divisors, whose sum is σ = 2287382. Its totient is φ = 2287380.

The previous prime is 2287343. The next prime is 2287387. The reversal of 2287381 is 1837822.

2287381 is nontrivially palindromic in base 9.

2287381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2002225 + 285156 = 1415^2 + 534^2 .

It is a cyclic number.

It is not a de Polignac number, because 2287381 - 2¹¹ = 2285333 is a prime.

It is a super-2 number, since 2×2287381² = 10464223678322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2287387) 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 as a sum of consecutive naturals, namely, 1143690 + 1143691.

It is an arithmetic number, because the mean of its divisors is an integer number (1143691).

2^2287381 is an apocalyptic number.

It is an amenable number.

2287381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2287381 is an equidigital number, since it uses as much as digits as its factorization.

2287381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 2287381 is about 1512.4090055273. The cubic root of 2287381 is about 131.7587612560.

The spelling of 2287381 in words is "two million, two hundred eighty-seven thousand, three hundred eighty-one".