2154881 has 2 divisors, whose sum is σ = 2154882. Its totient is φ = 2154880.

The previous prime is 2154871. The next prime is 2154899. The reversal of 2154881 is 1884512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2076481 + 78400 = 1441^2 + 280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154881 is a prime.

It is a super-2 number, since 2×2154881² = 9287024248322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2154811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077440 + 1077441.

It is an arithmetic number, because the mean of its divisors is an integer number (1077441).

2^2154881 is an apocalyptic number.

It is an amenable number.

2154881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154881 is an equidigital number, since it uses as much as digits as its factorization.

2154881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 29.

The square root of 2154881 is about 1467.9512934699. The cubic root of 2154881 is about 129.1638844123.

The spelling of 2154881 in words is "two million, one hundred fifty-four thousand, eight hundred eighty-one".