2227991 has 4 divisors (see below), whose sum is σ = 2231184. Its totient is φ = 2224800.

The previous prime is 2227963. The next prime is 2228011. The reversal of 2227991 is 1997222.

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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2227991 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2227591) 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, 50 + ... + 2111.

It is an arithmetic number, because the mean of its divisors is an integer number (557796).

2^2227991 is an apocalyptic number.

2227991 is a deficient number, since it is larger than the sum of its proper divisors (3193).

2227991 is a wasteful number, since it uses less digits than its factorization.

2227991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3192.

The product of its digits is 4536, while the sum is 32.

The square root of 2227991 is about 1492.6456377855. The cubic root of 2227991 is about 130.6084104753.

The spelling of 2227991 in words is "two million, two hundred twenty-seven thousand, nine hundred ninety-one".