2771391 has 24 divisors (see below), whose sum is σ = 4555440. Its totient is φ = 1489152.

The previous prime is 2771389. The next prime is 2771401. The reversal of 2771391 is 1931772.

It is not a de Polignac number, because 2771391 - 2¹ = 2771389 is a prime.

2771391 is a lucky number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2771341) 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 in 23 ways as a sum of consecutive naturals, for example, 1945 + ... + 3053.

It is an arithmetic number, because the mean of its divisors is an integer number (189810).

2^2771391 is an apocalyptic number.

2771391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2771391 is a deficient number, since it is larger than the sum of its proper divisors (1784049).

2771391 is a wasteful number, since it uses less digits than its factorization.

2771391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143 (or 1136 counting only the distinct ones).

The product of its digits is 2646, while the sum is 30.

The square root of 2771391 is about 1664.7495307103. The cubic root of 2771391 is about 140.4642918673.

It can be divided in two parts, 277139 and 1, that added together give a triangular number (277140 = T₇₄₄).

The spelling of 2771391 in words is "two million, seven hundred seventy-one thousand, three hundred ninety-one".