2191361 has 4 divisors (see below), whose sum is σ = 2194500. Its totient is φ = 2188224.

The previous prime is 2191339. The next prime is 2191363. The reversal of 2191361 is 1631912.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1960000 + 231361 = 1400^2 + 481^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191361 - 2¹⁰ = 2190337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2191363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5 + ... + 2093.

It is an arithmetic number, because the mean of its divisors is an integer number (548625).

It is a Proth number, since it is equal to 535 ⋅ 2¹² + 1 and 535 < 2¹².

2^2191361 is an apocalyptic number.

It is an amenable number.

2191361 is a deficient number, since it is larger than the sum of its proper divisors (3139).

2191361 is a wasteful number, since it uses less digits than its factorization.

2191361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138.

The product of its digits is 324, while the sum is 23.

The square root of 2191361 is about 1480.3246265600. The cubic root of 2191361 is about 129.8886818265. Note that the first 3 decimals are identical.

It can be divided in two parts, 2191 and 361, that added together give a palindrome (2552).

The spelling of 2191361 in words is "two million, one hundred ninety-one thousand, three hundred sixty-one".