1042646909 has 2 divisors, whose sum is σ = 1042646910. Its totient is φ = 1042646908.

The previous prime is 1042646903. The next prime is 1042646911. The reversal of 1042646909 is 9096462401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1042644100 + 2809 = 32290^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042646909 - 2⁴ = 1042646893 is a prime.

It is a super-2 number, since 2×1042646909² = 2174225153694508562, which contains 22 as substring.

Together with 1042646911, 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 (1042646903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521323454 + 521323455.

It is an arithmetic number, because the mean of its divisors is an integer number (521323455).

Almost surely, 2^1042646909 is an apocalyptic number.

It is an amenable number.

1042646909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042646909 is an equidigital number, since it uses as much as digits as its factorization.

1042646909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 1042646909 is about 32290.0434964092. The cubic root of 1042646909 is about 1014.0182079394.

The spelling of 1042646909 in words is "one billion, forty-two million, six hundred forty-six thousand, nine hundred nine".