1142405909 has 2 divisors, whose sum is σ = 1142405910. Its totient is φ = 1142405908.

The previous prime is 1142405879. The next prime is 1142405911. The reversal of 1142405909 is 9095042411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1132659025 + 9746884 = 33655^2 + 3122^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142405909 - 2¹⁶ = 1142340373 is a prime.

Together with 1142405911, 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 (1142405809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571202954 + 571202955.

It is an arithmetic number, because the mean of its divisors is an integer number (571202955).

Almost surely, 2^1142405909 is an apocalyptic number.

It is an amenable number.

1142405909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142405909 is an equidigital number, since it uses as much as digits as its factorization.

1142405909 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1142405909 is about 33799.4956915040. The cubic root of 1142405909 is about 1045.3782988167.

The spelling of 1142405909 in words is "one billion, one hundred forty-two million, four hundred five thousand, nine hundred nine".