2181147 has 4 divisors (see below), whose sum is σ = 2908200. Its totient is φ = 1454096.

The previous prime is 2181139. The next prime is 2181149. The reversal of 2181147 is 7411812.

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

It is a cyclic number.

It is not a de Polignac number, because 2181147 - 2³ = 2181139 is a prime.

It is a D-number.

2181147 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2181149) 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, 363522 + ... + 363527.

It is an arithmetic number, because the mean of its divisors is an integer number (727050).

2^2181147 is an apocalyptic number.

2181147 is a deficient number, since it is larger than the sum of its proper divisors (727053).

2181147 is an equidigital number, since it uses as much as digits as its factorization.

2181147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727052.

The product of its digits is 448, while the sum is 24.

The square root of 2181147 is about 1476.8706781570. The cubic root of 2181147 is about 129.6865624454.

Adding to 2181147 its reverse (7411812), we get a palindrome (9592959).

The spelling of 2181147 in words is "two million, one hundred eighty-one thousand, one hundred forty-seven".