2177881 has 2 divisors, whose sum is σ = 2177882. Its totient is φ = 2177880.

The previous prime is 2177827. The next prime is 2177891. The reversal of 2177881 is 1887712.

2177881 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., 1440000 + 737881 = 1200^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 2177881 - 2⁷ = 2177753 is a prime.

It is a super-2 number, since 2×2177881² = 9486331300322, which contains 22 as substring.

2177881 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2177891) 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, 1088940 + 1088941.

It is an arithmetic number, because the mean of its divisors is an integer number (1088941).

2^2177881 is an apocalyptic number.

It is an amenable number.

2177881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2177881 is an equidigital number, since it uses as much as digits as its factorization.

2177881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272, while the sum is 34.

The square root of 2177881 is about 1475.7645476159. The cubic root of 2177881 is about 129.6218002054.

The spelling of 2177881 in words is "two million, one hundred seventy-seven thousand, eight hundred eighty-one".