1363278891 has 12 divisors (see below), whose sum is σ = 1968285048. Its totient is φ = 838940544.

The previous prime is 1363278871. The next prime is 1363278913. The reversal of 1363278891 is 1988723631.

It is not a de Polignac number, because 1363278891 - 2⁶ = 1363278827 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1363278891.

It is not an unprimeable number, because it can be changed into a prime (1363278811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1343950 + ... + 1344963.

It is an arithmetic number, because the mean of its divisors is an integer number (164023754).

Almost surely, 2^1363278891 is an apocalyptic number.

1363278891 is a deficient number, since it is larger than the sum of its proper divisors (605006157).

1363278891 is a wasteful number, since it uses less digits than its factorization.

1363278891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688942 (or 2688929 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 1363278891 is about 36922.6067741702. The cubic root of 1363278891 is about 1108.8213257469.

The spelling of 1363278891 in words is "one billion, three hundred sixty-three million, two hundred seventy-eight thousand, eight hundred ninety-one".