1009666549 has 4 divisors (see below), whose sum is σ = 1031148864. Its totient is φ = 988184236.

The previous prime is 1009666487. The next prime is 1009666583. The reversal of 1009666549 is 9456669001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1009666549 - 2⁹ = 1009666037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1009666499 and 1009666508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009664549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10741087 + ... + 10741180.

It is an arithmetic number, because the mean of its divisors is an integer number (257787216).

Almost surely, 2^1009666549 is an apocalyptic number.

It is an amenable number.

1009666549 is a deficient number, since it is larger than the sum of its proper divisors (21482315).

1009666549 is an equidigital number, since it uses as much as digits as its factorization.

1009666549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21482314.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 1009666549 is about 31775.2505733629. The cubic root of 1009666549 is about 1003.2118559369.

The spelling of 1009666549 in words is "one billion, nine million, six hundred sixty-six thousand, five hundred forty-nine".