1187189 has 2 divisors, whose sum is σ = 1187190. Its totient is φ = 1187188.

The previous prime is 1187167. The next prime is 1187201. The reversal of 1187189 is 9817811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966289 + 220900 = 983^2 + 470^2 .

It is an emirp because it is prime and its reverse (9817811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1187189 - 2¹² = 1183093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593594 + 593595.

It is an arithmetic number, because the mean of its divisors is an integer number (593595).

2^1187189 is an apocalyptic number.

It is an amenable number.

1187189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187189 is an equidigital number, since it uses as much as digits as its factorization.

1187189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 35.

The square root of 1187189 is about 1089.5820299546. The cubic root of 1187189 is about 105.8863443000.

The spelling of 1187189 in words is "one million, one hundred eighty-seven thousand, one hundred eighty-nine".