1366480891 has 4 divisors (see below), whose sum is σ = 1372608832. Its totient is φ = 1360352952.

The previous prime is 1366480889. The next prime is 1366480903. The reversal of 1366480891 is 1980846631.

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 1366480891 - 2¹ = 1366480889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1366480391) 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, 3063636 + ... + 3064081.

It is an arithmetic number, because the mean of its divisors is an integer number (343152208).

Almost surely, 2^1366480891 is an apocalyptic number.

1366480891 is a deficient number, since it is larger than the sum of its proper divisors (6127941).

1366480891 is an equidigital number, since it uses as much as digits as its factorization.

1366480891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127940.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1366480891 is about 36965.9423118091. The cubic root of 1366480891 is about 1109.6887613166.

The spelling of 1366480891 in words is "one billion, three hundred sixty-six million, four hundred eighty thousand, eight hundred ninety-one".