1166921 has 4 divisors (see below), whose sum is σ = 1333632. Its totient is φ = 1000212.

The previous prime is 1166903. The next prime is 1166927. The reversal of 1166921 is 1296611.

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: 1296611 = 367 ⋅3533.

It is a cyclic number.

It is not a de Polignac number, because 1166921 - 2⁶ = 1166857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166927) 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, 83345 + ... + 83358.

It is an arithmetic number, because the mean of its divisors is an integer number (333408).

2^1166921 is an apocalyptic number.

It is an amenable number.

1166921 is a deficient number, since it is larger than the sum of its proper divisors (166711).

1166921 is an equidigital number, since it uses as much as digits as its factorization.

1166921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166710.

The product of its digits is 648, while the sum is 26.

The square root of 1166921 is about 1080.2411767749. The cubic root of 1166921 is about 105.2803092184.

The spelling of 1166921 in words is "one million, one hundred sixty-six thousand, nine hundred twenty-one".