11791813 has 6 divisors (see below), whose sum is σ = 12961382. Its totient is φ = 10719720.

The previous prime is 11791807. The next prime is 11791817. The reversal of 11791813 is 31819711.

It can be written as a sum of positive squares in only one way, i.e., 10745284 + 1046529 = 3278^2 + 1023^2 .

It is not a de Polignac number, because 11791813 - 2⁵ = 11791781 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 (11791817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48606 + ... + 48847.

Almost surely, 2^11791813 is an apocalyptic number.

It is an amenable number.

11791813 is a deficient number, since it is larger than the sum of its proper divisors (1169569).

11791813 is an equidigital number, since it uses as much as digits as its factorization.

11791813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97475 (or 97464 counting only the distinct ones).

The product of its digits is 1512, while the sum is 31.

The square root of 11791813 is about 3433.9209367718. The cubic root of 11791813 is about 227.6111472349.

It can be divided in two parts, 1179 and 1813, that added together give a palindrome (2992).

The spelling of 11791813 in words is "eleven million, seven hundred ninety-one thousand, eight hundred thirteen".