11543551 has 2 divisors, whose sum is σ = 11543552. Its totient is φ = 11543550.

The previous prime is 11543549. The next prime is 11543603. The reversal of 11543551 is 15534511.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (15534511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11543551 - 2¹ = 11543549 is a prime.

Together with 11543549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11543351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5771775 + 5771776.

It is an arithmetic number, because the mean of its divisors is an integer number (5771776).

Almost surely, 2^11543551 is an apocalyptic number.

11543551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11543551 is an equidigital number, since it uses as much as digits as its factorization.

11543551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500, while the sum is 25.

The square root of 11543551 is about 3397.5801682963. The cubic root of 11543551 is about 226.0024473069.

The spelling of 11543551 in words is "eleven million, five hundred forty-three thousand, five hundred fifty-one".