1073691209 has 4 divisors (see below), whose sum is σ = 1098660816. Its totient is φ = 1048721604.

The previous prime is 1073691193. The next prime is 1073691211. The reversal of 1073691209 is 9021963701.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9021963701 = 59 ⋅152914639.

It is a cyclic number.

It is not a de Polignac number, because 1073691209 - 2⁴ = 1073691193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1073691239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12484739 + ... + 12484824.

It is an arithmetic number, because the mean of its divisors is an integer number (274665204).

Almost surely, 2^1073691209 is an apocalyptic number.

It is an amenable number.

1073691209 is a deficient number, since it is larger than the sum of its proper divisors (24969607).

1073691209 is an equidigital number, since it uses as much as digits as its factorization.

1073691209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24969606.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 1073691209 is about 32767.2276672898. The cubic root of 1073691209 is about 1023.9839096720.

The spelling of 1073691209 in words is "one billion, seventy-three million, six hundred ninety-one thousand, two hundred nine".