2781377 has 2 divisors, whose sum is σ = 2781378. Its totient is φ = 2781376.

The previous prime is 2781349. The next prime is 2781379. The reversal of 2781377 is 7731872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2202256 + 579121 = 1484^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781377 - 2⁶ = 2781313 is a prime.

It is a super-2 number, since 2×2781377² = 15472116032258, which contains 22 as substring.

Together with 2781379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2781379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390688 + 1390689.

It is an arithmetic number, because the mean of its divisors is an integer number (1390689).

2^2781377 is an apocalyptic number.

It is an amenable number.

2781377 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781377 is an equidigital number, since it uses as much as digits as its factorization.

2781377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16464, while the sum is 35.

The square root of 2781377 is about 1667.7460837909. The cubic root of 2781377 is about 140.6327987115.

The spelling of 2781377 in words is "two million, seven hundred eighty-one thousand, three hundred seventy-seven".