1156543 has 4 divisors (see below), whose sum is σ = 1159648. Its totient is φ = 1153440.

The previous prime is 1156541. The next prime is 1156553. The reversal of 1156543 is 3456511.

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 1156543 - 2¹ = 1156541 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 (1156541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (289912).

2^1156543 is an apocalyptic number.

1156543 is a deficient number, since it is larger than the sum of its proper divisors (3105).

1156543 is an equidigital number, since it uses as much as digits as its factorization.

1156543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104.

The product of its digits is 1800, while the sum is 25.

The square root of 1156543 is about 1075.4268919829. The cubic root of 1156543 is about 104.9672762727.

Subtracting 1156543 from its reverse (3456511), we obtain a cube (2299968 = 132³).

The spelling of 1156543 in words is "one million, one hundred fifty-six thousand, five hundred forty-three".