1166551 has 4 divisors (see below), whose sum is σ = 1170592. Its totient is φ = 1162512.

The previous prime is 1166549. The next prime is 1166563. The reversal of 1166551 is 1556611.

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 1166551 - 2¹ = 1166549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166531) 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, 1551 + ... + 2176.

It is an arithmetic number, because the mean of its divisors is an integer number (292648).

2^1166551 is an apocalyptic number.

1166551 is a deficient number, since it is larger than the sum of its proper divisors (4041).

1166551 is an equidigital number, since it uses as much as digits as its factorization.

1166551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040.

The product of its digits is 900, while the sum is 25.

The square root of 1166551 is about 1080.0699051450. The cubic root of 1166551 is about 105.2691808352.

The spelling of 1166551 in words is "one million, one hundred sixty-six thousand, five hundred fifty-one".