2170813 has 2 divisors, whose sum is σ = 2170814. Its totient is φ = 2170812.

The previous prime is 2170783. The next prime is 2170823. The reversal of 2170813 is 3180712.

It is the 602-nd star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1965604 + 205209 = 1402^2 + 453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2170813 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2170823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085406 + 1085407.

It is an arithmetic number, because the mean of its divisors is an integer number (1085407).

2^2170813 is an apocalyptic number.

It is an amenable number.

2170813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170813 is an equidigital number, since it uses as much as digits as its factorization.

2170813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 2170813 is about 1473.3679106048. The cubic root of 2170813 is about 129.4814252613.

The spelling of 2170813 in words is "two million, one hundred seventy thousand, eight hundred thirteen".