1189621 has 2 divisors, whose sum is σ = 1189622. Its totient is φ = 1189620.

The previous prime is 1189613. The next prime is 1189627. The reversal of 1189621 is 1269811.

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., 1188100 + 1521 = 1090^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189621 - 2³ = 1189613 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1189621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1189627) 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, 594810 + 594811.

It is an arithmetic number, because the mean of its divisors is an integer number (594811).

2^1189621 is an apocalyptic number.

It is an amenable number.

1189621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189621 is an equidigital number, since it uses as much as digits as its factorization.

1189621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 1189621 is about 1090.6974832647. The cubic root of 1189621 is about 105.9585989974.

The spelling of 1189621 in words is "one million, one hundred eighty-nine thousand, six hundred twenty-one".