1121647 has 4 divisors (see below), whose sum is σ = 1138456. Its totient is φ = 1104840.

The previous prime is 1121629. The next prime is 1121651. The reversal of 1121647 is 7461211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121047) 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, 8304 + ... + 8437.

It is an arithmetic number, because the mean of its divisors is an integer number (284614).

2^1121647 is an apocalyptic number.

1121647 is a deficient number, since it is larger than the sum of its proper divisors (16809).

1121647 is an equidigital number, since it uses as much as digits as its factorization.

1121647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16808.

The product of its digits is 336, while the sum is 22.

The square root of 1121647 is about 1059.0783729262. The cubic root of 1121647 is about 103.9007620917.

Adding to 1121647 its reverse (7461211), we get a palindrome (8582858).

The spelling of 1121647 in words is "one million, one hundred twenty-one thousand, six hundred forty-seven".