11681813 has 16 divisors (see below), whose sum is σ = 13840512. Its totient is φ = 9720000.

The previous prime is 11681801. The next prime is 11681833. The reversal of 11681813 is 31818611.

It is a cyclic number.

It is not a de Polignac number, because 11681813 - 2⁸ = 11681557 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 (11681833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21323 + ... + 21863.

It is an arithmetic number, because the mean of its divisors is an integer number (865032).

Almost surely, 2^11681813 is an apocalyptic number.

11681813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11681813 is a deficient number, since it is larger than the sum of its proper divisors (2158699).

11681813 is a wasteful number, since it uses less digits than its factorization.

11681813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its digits is 1152, while the sum is 29.

The square root of 11681813 is about 3417.8667323347. The cubic root of 11681813 is about 226.9011776567.

The spelling of 11681813 in words is "eleven million, six hundred eighty-one thousand, eight hundred thirteen".