2170643 has 2 divisors, whose sum is σ = 2170644. Its totient is φ = 2170642.

The previous prime is 2170639. The next prime is 2170657. The reversal of 2170643 is 3460712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2170643 - 2² = 2170639 is a prime.

It is not a weakly prime, because it can be changed into another prime (2170603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085321 + 1085322.

It is an arithmetic number, because the mean of its divisors is an integer number (1085322).

2^2170643 is an apocalyptic number.

2170643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170643 is an equidigital number, since it uses as much as digits as its factorization.

2170643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 2170643 is about 1473.3102185215. The cubic root of 2170643 is about 129.4780452040.

It can be divided in two parts, 21 and 70643, that multiplied together give a triangular number (1483503 = T₁₇₂₂).

The spelling of 2170643 in words is "two million, one hundred seventy thousand, six hundred forty-three".