2154643 has 2 divisors, whose sum is σ = 2154644. Its totient is φ = 2154642.

The previous prime is 2154641. The next prime is 2154667. The reversal of 2154643 is 3464512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154643 - 2¹ = 2154641 is a prime.

Together with 2154641, it forms a pair of twin primes.

2154643 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2154641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077321 + 1077322.

It is an arithmetic number, because the mean of its divisors is an integer number (1077322).

2^2154643 is an apocalyptic number.

2154643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154643 is an equidigital number, since it uses as much as digits as its factorization.

2154643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 2154643 is about 1467.8702258715. The cubic root of 2154643 is about 129.1591289855.

The spelling of 2154643 in words is "two million, one hundred fifty-four thousand, six hundred forty-three".