11208437813 has 4 divisors (see below), whose sum is σ = 11210115180. Its totient is φ = 11206760448.

The previous prime is 11208437803. The next prime is 11208437831. The reversal of 11208437813 is 31873480211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31873480211 = 31 ⋅1028176781.

It can be written as a sum of positive squares in 2 ways, for example, as 3513288529 + 7695149284 = 59273^2 + 87722^2 .

It is a cyclic number.

It is not a de Polignac number, because 11208437813 - 2⁴ = 11208437797 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 (11208437803) 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, 828620 + ... + 842037.

It is an arithmetic number, because the mean of its divisors is an integer number (2802528795).

Almost surely, 2^11208437813 is an apocalyptic number.

It is an amenable number.

11208437813 is a deficient number, since it is larger than the sum of its proper divisors (1677367).

11208437813 is an equidigital number, since it uses as much as digits as its factorization.

11208437813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677366.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 11208437813 in words is "eleven billion, two hundred eight million, four hundred thirty-seven thousand, eight hundred thirteen".