11955553 has 4 divisors (see below), whose sum is σ = 12341248. Its totient is φ = 11569860.

The previous prime is 11955533. The next prime is 11955571. The reversal of 11955553 is 35555911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11955553 - 2⁵ = 11955521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11955533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192801 + ... + 192862.

It is an arithmetic number, because the mean of its divisors is an integer number (3085312).

Almost surely, 2^11955553 is an apocalyptic number.

It is an amenable number.

11955553 is a deficient number, since it is larger than the sum of its proper divisors (385695).

11955553 is an equidigital number, since it uses as much as digits as its factorization.

11955553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385694.

The product of its digits is 16875, while the sum is 34.

The square root of 11955553 is about 3457.6802917563. The cubic root of 11955553 is about 228.6598370615.

The spelling of 11955553 in words is "eleven million, nine hundred fifty-five thousand, five hundred fifty-three".