1209440159 has 2 divisors, whose sum is σ = 1209440160. Its totient is φ = 1209440158.

The previous prime is 1209440149. The next prime is 1209440161. The reversal of 1209440159 is 9510449021.

It is a strong prime.

It is an emirp because it is prime and its reverse (9510449021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209440159 is a prime.

Together with 1209440161, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209440149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604720079 + 604720080.

It is an arithmetic number, because the mean of its divisors is an integer number (604720080).

Almost surely, 2^1209440159 is an apocalyptic number.

1209440159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209440159 is an equidigital number, since it uses as much as digits as its factorization.

1209440159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1209440159 is about 34777.0061822463. The cubic root of 1209440159 is about 1065.4378676614.

The spelling of 1209440159 in words is "one billion, two hundred nine million, four hundred forty thousand, one hundred fifty-nine".