11621905 has 4 divisors (see below), whose sum is σ = 13946292. Its totient is φ = 9297520.

The previous prime is 11621873. The next prime is 11621921. The reversal of 11621905 is 50912611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50912611 = 41 ⋅1241771.

It can be written as a sum of positive squares in 2 ways, for example, as 2178576 + 9443329 = 1476^2 + 3073^2 .

It is not a de Polignac number, because 11621905 - 2⁵ = 11621873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11621905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162186 + ... + 1162195.

It is an arithmetic number, because the mean of its divisors is an integer number (3486573).

Almost surely, 2^11621905 is an apocalyptic number.

It is an amenable number.

11621905 is a deficient number, since it is larger than the sum of its proper divisors (2324387).

11621905 is an equidigital number, since it uses as much as digits as its factorization.

11621905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324386.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 11621905 is about 3409.0915212121. The cubic root of 11621905 is about 226.5126392536.

The spelling of 11621905 in words is "eleven million, six hundred twenty-one thousand, nine hundred five".