11720543 has 4 divisors (see below), whose sum is σ = 11727408. Its totient is φ = 11713680.

The previous prime is 11720537. The next prime is 11720551. The reversal of 11720543 is 34502711.

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 not a de Polignac number, because 11720543 - 2⁸ = 11720287 is a prime.

It is a super-2 number, since 2×11720543² = 274742256429698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11725543) 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, 1355 + ... + 5027.

It is an arithmetic number, because the mean of its divisors is an integer number (2931852).

Almost surely, 2^11720543 is an apocalyptic number.

11720543 is a deficient number, since it is larger than the sum of its proper divisors (6865).

11720543 is an equidigital number, since it uses as much as digits as its factorization.

11720543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6864.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 11720543 is about 3423.5278588030. The cubic root of 11720543 is about 227.1516578589.

The spelling of 11720543 in words is "eleven million, seven hundred twenty thousand, five hundred forty-three".