1363809891 has 4 divisors (see below), whose sum is σ = 1818413192. Its totient is φ = 909206592.

The previous prime is 1363809869. The next prime is 1363809901. The reversal of 1363809891 is 1989083631.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1363809891 - 2¹¹ = 1363807843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1363809891.

It is not an unprimeable number, because it can be changed into a prime (1363809791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227301646 + ... + 227301651.

It is an arithmetic number, because the mean of its divisors is an integer number (454603298).

Almost surely, 2^1363809891 is an apocalyptic number.

1363809891 is a deficient number, since it is larger than the sum of its proper divisors (454603301).

1363809891 is an equidigital number, since it uses as much as digits as its factorization.

1363809891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454603300.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 1363809891 is about 36929.7967906676. The cubic root of 1363809891 is about 1108.9652698071.

The spelling of 1363809891 in words is "one billion, three hundred sixty-three million, eight hundred nine thousand, eight hundred ninety-one".