2161373 has 2 divisors, whose sum is σ = 2161374. Its totient is φ = 2161372.

The previous prime is 2161349. The next prime is 2161409. The reversal of 2161373 is 3731612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1951609 + 209764 = 1397^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161373 - 2¹⁰ = 2160349 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 6⁶ + 1 + 3³ + 7⁵ + 3⁶ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161303) 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, 1080686 + 1080687.

It is an arithmetic number, because the mean of its divisors is an integer number (1080687).

2^2161373 is an apocalyptic number.

It is an amenable number.

2161373 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161373 is an equidigital number, since it uses as much as digits as its factorization.

2161373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 23.

The square root of 2161373 is about 1470.1608755507. The cubic root of 2161373 is about 129.2934648491.

Adding to 2161373 its reverse (3731612), we get a palindrome (5892985).

The spelling of 2161373 in words is "two million, one hundred sixty-one thousand, three hundred seventy-three".