1066391729 has 4 divisors (see below), whose sum is σ = 1148421876. Its totient is φ = 984361584.

The previous prime is 1066391699. The next prime is 1066391743. The reversal of 1066391729 is 9271936601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9271936601 = 1823 ⋅5086087.

It can be written as a sum of positive squares in 2 ways, for example, as 193071025 + 873320704 = 13895^2 + 29552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066391729 is a prime.

It is a super-2 number, since 2×1066391729² = 2274382639359218882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1066391729.

It is not an unprimeable number, because it can be changed into a prime (1066391329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41015054 + ... + 41015079.

It is an arithmetic number, because the mean of its divisors is an integer number (287105469).

Almost surely, 2^1066391729 is an apocalyptic number.

It is an amenable number.

1066391729 is a deficient number, since it is larger than the sum of its proper divisors (82030147).

1066391729 is an equidigital number, since it uses as much as digits as its factorization.

1066391729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82030146.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1066391729 is about 32655.6538596305. The cubic root of 1066391729 is about 1021.6581159282.

The spelling of 1066391729 in words is "one billion, sixty-six million, three hundred ninety-one thousand, seven hundred twenty-nine".