2427781 has 2 divisors, whose sum is σ = 2427782. Its totient is φ = 2427780.

The previous prime is 2427779. The next prime is 2427797. The reversal of 2427781 is 1877242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2402500 + 25281 = 1550^2 + 159^2 .

It is a cyclic number.

It is not a de Polignac number, because 2427781 - 2¹ = 2427779 is a prime.

It is a super-2 number, since 2×2427781² = 11788241167922, which contains 22 as substring.

Together with 2427779, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2427701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1213890 + 1213891.

It is an arithmetic number, because the mean of its divisors is an integer number (1213891).

2^2427781 is an apocalyptic number.

It is an amenable number.

2427781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2427781 is an equidigital number, since it uses as much as digits as its factorization.

2427781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272, while the sum is 31.

The square root of 2427781 is about 1558.1338196702. The cubic root of 2427781 is about 134.4012071474.

The spelling of 2427781 in words is "two million, four hundred twenty-seven thousand, seven hundred eighty-one".