2161493 has 2 divisors, whose sum is σ = 2161494. Its totient is φ = 2161492.

The previous prime is 2161469. The next prime is 2161513. The reversal of 2161493 is 3941612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1532644 + 628849 = 1238^2 + 793^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161493 - 2¹⁰ = 2160469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080746 + 1080747.

It is an arithmetic number, because the mean of its divisors is an integer number (1080747).

2^2161493 is an apocalyptic number.

It is an amenable number.

2161493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161493 is an equidigital number, since it uses as much as digits as its factorization.

2161493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 2161493 is about 1470.2016868444. The cubic root of 2161493 is about 129.2958576072.

It can be divided in two parts, 21614 and 93, that multiplied together give a palindrome (2010102).

The spelling of 2161493 in words is "two million, one hundred sixty-one thousand, four hundred ninety-three".