2158361 has 4 divisors (see below), whose sum is σ = 2166324. Its totient is φ = 2150400.

The previous prime is 2158357. The next prime is 2158367. The reversal of 2158361 is 1638512.

2158361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1485961 + 672400 = 1219^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158361 - 2² = 2158357 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 2158361.

It is not an unprimeable number, because it can be changed into a prime (2158367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3560 + ... + 4121.

It is an arithmetic number, because the mean of its divisors is an integer number (541581).

2^2158361 is an apocalyptic number.

It is an amenable number.

2158361 is a deficient number, since it is larger than the sum of its proper divisors (7963).

2158361 is an equidigital number, since it uses as much as digits as its factorization.

2158361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7962.

The product of its digits is 1440, while the sum is 26.

The square root of 2158361 is about 1469.1361407303. The cubic root of 2158361 is about 129.2333775874.

The spelling of 2158361 in words is "two million, one hundred fifty-eight thousand, three hundred sixty-one".