1066391339 has 4 divisors (see below), whose sum is σ = 1148421456. Its totient is φ = 984361224.

The previous prime is 1066391329. The next prime is 1066391353. The reversal of 1066391339 is 9331936601.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1066391339 - 2¹⁶ = 1066325803 is a prime.

It is a super-2 number, since 2×1066391339² = 2274380975788425842, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066391296 and 1066391305.

It is not an unprimeable number, because it can be changed into a prime (1066391309) 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, 41015039 + ... + 41015064.

It is an arithmetic number, because the mean of its divisors is an integer number (287105364).

Almost surely, 2^1066391339 is an apocalyptic number.

1066391339 is a deficient number, since it is larger than the sum of its proper divisors (82030117).

1066391339 is an equidigital number, since it uses as much as digits as its factorization.

1066391339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82030116.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 1066391339 is about 32655.6478882291. The cubic root of 1066391339 is about 1021.6579913815.

The spelling of 1066391339 in words is "one billion, sixty-six million, three hundred ninety-one thousand, three hundred thirty-nine".