11955491 has 4 divisors (see below), whose sum is σ = 12341184. Its totient is φ = 11569800.

The previous prime is 11955467. The next prime is 11955499. The reversal of 11955491 is 19455911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19455911 = 157 ⋅123923.

It is a cyclic number.

It is not a de Polignac number, because 11955491 - 2¹⁴ = 11939107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11955499) 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, 192800 + ... + 192861.

It is an arithmetic number, because the mean of its divisors is an integer number (3085296).

Almost surely, 2^11955491 is an apocalyptic number.

11955491 is a deficient number, since it is larger than the sum of its proper divisors (385693).

11955491 is an equidigital number, since it uses as much as digits as its factorization.

11955491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385692.

The product of its digits is 8100, while the sum is 35.

The square root of 11955491 is about 3457.6713261963. The cubic root of 11955491 is about 228.6594417937.

The spelling of 11955491 in words is "eleven million, nine hundred fifty-five thousand, four hundred ninety-one".