2236991 has 4 divisors (see below), whose sum is σ = 2309184. Its totient is φ = 2164800.

The previous prime is 2236987. The next prime is 2236999. The reversal of 2236991 is 1996322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1996322 = 2 ⋅998161.

It is a cyclic number.

It is not a de Polignac number, because 2236991 - 2² = 2236987 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2236999) 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, 36050 + ... + 36111.

It is an arithmetic number, because the mean of its divisors is an integer number (577296).

2^2236991 is an apocalyptic number.

2236991 is a deficient number, since it is larger than the sum of its proper divisors (72193).

2236991 is an equidigital number, since it uses as much as digits as its factorization.

2236991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72192.

The product of its digits is 5832, while the sum is 32.

The square root of 2236991 is about 1495.6573805521. The cubic root of 2236991 is about 130.7840390204.

The spelling of 2236991 in words is "two million, two hundred thirty-six thousand, nine hundred ninety-one".