1166401311 has 4 divisors (see below), whose sum is σ = 1555201752. Its totient is φ = 777600872.

The previous prime is 1166401307. The next prime is 1166401321. The reversal of 1166401311 is 1131046611.

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 1166401311 - 2² = 1166401307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166401321) 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, 194400216 + ... + 194400221.

It is an arithmetic number, because the mean of its divisors is an integer number (388800438).

Almost surely, 2^1166401311 is an apocalyptic number.

1166401311 is a deficient number, since it is larger than the sum of its proper divisors (388800441).

1166401311 is an equidigital number, since it uses as much as digits as its factorization.

1166401311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388800440.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1166401311 is about 34152.6179230817. The cubic root of 1166401311 is about 1052.6467801379.

Adding to 1166401311 its reverse (1131046611), we get a palindrome (2297447922).

The spelling of 1166401311 in words is "one billion, one hundred sixty-six million, four hundred one thousand, three hundred eleven".