1166621 has 4 divisors (see below), whose sum is σ = 1177632. Its totient is φ = 1155612.

The previous prime is 1166617. The next prime is 1166639. The reversal of 1166621 is 1266611.

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.

It is a cyclic number.

It is not a de Polignac number, because 1166621 - 2² = 1166617 is a prime.

It is a super-2 number, since 2×1166621² = 2722009115282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5345 + ... + 5558.

It is an arithmetic number, because the mean of its divisors is an integer number (294408).

2^1166621 is an apocalyptic number.

It is an amenable number.

1166621 is a deficient number, since it is larger than the sum of its proper divisors (11011).

1166621 is a wasteful number, since it uses less digits than its factorization.

1166621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010.

The product of its digits is 432, while the sum is 23.

The square root of 1166621 is about 1080.1023099688. The cubic root of 1166621 is about 105.2712863855.

The spelling of 1166621 in words is "one million, one hundred sixty-six thousand, six hundred twenty-one".