2146561 has 2 divisors, whose sum is σ = 2146562. Its totient is φ = 2146560.

The previous prime is 2146549. The next prime is 2146589. The reversal of 2146561 is 1656412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1575025 + 571536 = 1255^2 + 756^2 .

It is a cyclic number.

It is not a de Polignac number, because 2146561 - 2⁷ = 2146433 is a prime.

2146561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2146511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1073280 + 1073281.

It is an arithmetic number, because the mean of its divisors is an integer number (1073281).

2^2146561 is an apocalyptic number.

It is an amenable number.

2146561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2146561 is an equidigital number, since it uses as much as digits as its factorization.

2146561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 2146561 is about 1465.1146712800. The cubic root of 2146561 is about 128.9974360006.

The spelling of 2146561 in words is "two million, one hundred forty-six thousand, five hundred sixty-one".