11989547 has 2 divisors, whose sum is σ = 11989548. Its totient is φ = 11989546.

The previous prime is 11989543. The next prime is 11989553. The reversal of 11989547 is 74598911.

11989547 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11989547 - 2² = 11989543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11989498 and 11989507.

It is not a weakly prime, because it can be changed into another prime (11989543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994773 + 5994774.

It is an arithmetic number, because the mean of its divisors is an integer number (5994774).

Almost surely, 2^11989547 is an apocalyptic number.

11989547 is a deficient number, since it is larger than the sum of its proper divisors (1).

11989547 is an equidigital number, since it uses as much as digits as its factorization.

11989547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 11989547 is about 3462.5925258396. The cubic root of 11989547 is about 228.8763530994.

The spelling of 11989547 in words is "eleven million, nine hundred eighty-nine thousand, five hundred forty-seven".