1066691 has 4 divisors (see below), whose sum is σ = 1074000.
Its totient is φ = 1059384.
The previous prime is 1066687. The next prime is 1066693. The reversal of 1066691 is 1966601.
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 1066691 - 22 = 1066687 is a prime.
It is a super-2 number, since 2×10666912 = 2275659378962, which contains 22 as substring.
It is an Ulam number.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1066693) 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, 3431 + ... + 3728.
It is an arithmetic number, because the mean of its divisors is an integer number (268500).
21066691 is an apocalyptic number.
1066691 is a deficient number, since it is larger than the sum of its proper divisors (7309).
1066691 is an equidigital number, since it uses as much as digits as its factorization.
1066691 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7308.
The product of its (nonzero) digits is 1944, while the sum is 29.
The square root of 1066691 is about 1032.8073392458.
The cubic root of 1066691 is about 102.1753679325.
The spelling of 1066691 in words is "one million, sixty-six thousand, six hundred ninety-one".