11955817 has 4 divisors (see below), whose sum is σ = 12151876. Its totient is φ = 11759760.

The previous prime is 11955809. The next prime is 11955821. The reversal of 11955817 is 71855911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71855911 = 139 ⋅516949.

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 11689561 = 516^2 + 3419^2 .

It is a cyclic number.

It is not a de Polignac number, because 11955817 - 2³ = 11955809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11955877) 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, 97938 + ... + 98059.

It is an arithmetic number, because the mean of its divisors is an integer number (3037969).

Almost surely, 2^11955817 is an apocalyptic number.

It is an amenable number.

11955817 is a deficient number, since it is larger than the sum of its proper divisors (196059).

11955817 is an equidigital number, since it uses as much as digits as its factorization.

11955817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196058.

The product of its digits is 12600, while the sum is 37.

The square root of 11955817 is about 3457.7184674291. The cubic root of 11955817 is about 228.6615201219.

The spelling of 11955817 in words is "eleven million, nine hundred fifty-five thousand, eight hundred seventeen".