1121567 has 4 divisors (see below), whose sum is σ = 1132560. Its totient is φ = 1110576.

The previous prime is 1121557. The next prime is 1121599. The reversal of 1121567 is 7651211.

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 1121567 - 2¹⁰ = 1120543 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 (1121557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5342 + ... + 5547.

It is an arithmetic number, because the mean of its divisors is an integer number (283140).

2^1121567 is an apocalyptic number.

1121567 is a deficient number, since it is larger than the sum of its proper divisors (10993).

1121567 is a wasteful number, since it uses less digits than its factorization.

1121567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10992.

The product of its digits is 420, while the sum is 23.

The square root of 1121567 is about 1059.0406035653. The cubic root of 1121567 is about 103.8982918378.

Adding to 1121567 its reverse (7651211), we get a palindrome (8772778).

The spelling of 1121567 in words is "one million, one hundred twenty-one thousand, five hundred sixty-seven".