1042139009 has 2 divisors, whose sum is σ = 1042139010. Its totient is φ = 1042139008.

The previous prime is 1042138991. The next prime is 1042139011. The reversal of 1042139009 is 9009312401.

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., 913248400 + 128890609 = 30220^2 + 11353^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042139009 - 2⁸ = 1042138753 is a prime.

It is a super-3 number, since 3×1042139009³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 1042139011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1042139029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521069504 + 521069505.

It is an arithmetic number, because the mean of its divisors is an integer number (521069505).

Almost surely, 2^1042139009 is an apocalyptic number.

It is an amenable number.

1042139009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042139009 is an equidigital number, since it uses as much as digits as its factorization.

1042139009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1042139009 is about 32282.1778850188. The cubic root of 1042139009 is about 1013.8535297879.

The spelling of 1042139009 in words is "one billion, forty-two million, one hundred thirty-nine thousand, nine".