1208320813 has 32 divisors (see below), whose sum is σ = 1437308928. Its totient is φ = 994593600.

The previous prime is 1208320787. The next prime is 1208320823. The reversal of 1208320813 is 3180238021.

It is not a de Polignac number, because 1208320813 - 2²⁵ = 1174766381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1208320823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4362031 + ... + 4362307.

It is an arithmetic number, because the mean of its divisors is an integer number (44915904).

Almost surely, 2^1208320813 is an apocalyptic number.

It is an amenable number.

1208320813 is a deficient number, since it is larger than the sum of its proper divisors (228988115).

1208320813 is a wasteful number, since it uses less digits than its factorization.

1208320813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1208320813 is about 34760.9092660132. The cubic root of 1208320813 is about 1065.1090759435.

Adding to 1208320813 its reverse (3180238021), we get a palindrome (4388558834).

It can be divided in two parts, 12083 and 20813, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 1208320813 in words is "one billion, two hundred eight million, three hundred twenty thousand, eight hundred thirteen".