2921881 has 2 divisors, whose sum is σ = 2921882. Its totient is φ = 2921880.

The previous prime is 2921879. The next prime is 2921899. The reversal of 2921881 is 1881292.

It is a happy number.

2921881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1798281 + 1123600 = 1341^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 2921881 - 2¹ = 2921879 is a prime.

It is a super-2 number, since 2×2921881² = 17074777156322, which contains 22 as substring.

Together with 2921879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2921861) 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, 1460940 + 1460941.

It is an arithmetic number, because the mean of its divisors is an integer number (1460941).

2^2921881 is an apocalyptic number.

It is an amenable number.

2921881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2921881 is an equidigital number, since it uses as much as digits as its factorization.

2921881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 31.

The square root of 2921881 is about 1709.3510464501. The cubic root of 2921881 is about 142.9620744780.

The spelling of 2921881 in words is "two million, nine hundred twenty-one thousand, eight hundred eighty-one".