1109639 has 2 divisors, whose sum is σ = 1109640. Its totient is φ = 1109638.

The previous prime is 1109629. The next prime is 1109653. The reversal of 1109639 is 9369011.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1109639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109609) 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, 554819 + 554820.

It is an arithmetic number, because the mean of its divisors is an integer number (554820).

2^1109639 is an apocalyptic number.

1109639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109639 is an equidigital number, since it uses as much as digits as its factorization.

1109639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1109639 is about 1053.3940383351. The cubic root of 1109639 is about 103.5286547341.

The spelling of 1109639 in words is "one million, one hundred nine thousand, six hundred thirty-nine".