1166727381 has 4 divisors (see below), whose sum is σ = 1555636512. Its totient is φ = 777818252.

The previous prime is 1166727361. The next prime is 1166727403. The reversal of 1166727381 is 1837276611.

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 1166727381 - 2¹¹ = 1166725333 is a prime.

It is a super-2 number, since 2×1166727381² = 2722505563150238322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166727361) 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, 194454561 + ... + 194454566.

It is an arithmetic number, because the mean of its divisors is an integer number (388909128).

Almost surely, 2^1166727381 is an apocalyptic number.

It is an amenable number.

1166727381 is a deficient number, since it is larger than the sum of its proper divisors (388909131).

1166727381 is an equidigital number, since it uses as much as digits as its factorization.

1166727381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388909130.

The product of its digits is 84672, while the sum is 42.

The square root of 1166727381 is about 34157.3913084709. The cubic root of 1166727381 is about 1052.7448608908.

The spelling of 1166727381 in words is "one billion, one hundred sixty-six million, seven hundred twenty-seven thousand, three hundred eighty-one".