11553813 has 8 divisors (see below), whose sum is σ = 17116800. Its totient is φ = 7702524.

The previous prime is 11553811. The next prime is 11553823. The reversal of 11553813 is 31835511.

11553813 is a `hidden beast` number, since 115 + 538 + 13 = 666.

It is not a de Polignac number, because 11553813 - 2¹ = 11553811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 427919 = 11553813 / (1 + 1 + 5 + 5 + 3 + 8 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11553811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213933 + ... + 213986.

It is an arithmetic number, because the mean of its divisors is an integer number (2139600).

Almost surely, 2^11553813 is an apocalyptic number.

It is an amenable number.

11553813 is a deficient number, since it is larger than the sum of its proper divisors (5562987).

11553813 is an equidigital number, since it uses as much as digits as its factorization.

11553813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427928 (or 427922 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 11553813 is about 3399.0900252862. The cubic root of 11553813 is about 226.0693981149.

The spelling of 11553813 in words is "eleven million, five hundred fifty-three thousand, eight hundred thirteen".