2145641 has 2 divisors, whose sum is σ = 2145642. Its totient is φ = 2145640.

The previous prime is 2145631. The next prime is 2145643. The reversal of 2145641 is 1465412.

2145641 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., 1371241 + 774400 = 1171^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145641 - 2¹⁰ = 2144617 is a prime.

Together with 2145643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2145643) 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, 1072820 + 1072821.

It is an arithmetic number, because the mean of its divisors is an integer number (1072821).

2^2145641 is an apocalyptic number.

It is an amenable number.

2145641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145641 is an equidigital number, since it uses as much as digits as its factorization.

2145641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 2145641 is about 1464.8006690332. The cubic root of 2145641 is about 128.9790042548.

The spelling of 2145641 in words is "two million, one hundred forty-five thousand, six hundred forty-one".