1189649 has 2 divisors, whose sum is σ = 1189650. Its totient is φ = 1189648.

The previous prime is 1189637. The next prime is 1189651. The reversal of 1189649 is 9469811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 66049 = 1060^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189649 - 2⁴ = 1189633 is a prime.

Together with 1189651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1119649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594824 + 594825.

It is an arithmetic number, because the mean of its divisors is an integer number (594825).

2^1189649 is an apocalyptic number.

It is an amenable number.

1189649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189649 is an equidigital number, since it uses as much as digits as its factorization.

1189649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 1189649 is about 1090.7103190123. The cubic root of 1189649 is about 105.9594303035.

The spelling of 1189649 in words is "one million, one hundred eighty-nine thousand, six hundred forty-nine".