11955391 has 4 divisors (see below), whose sum is σ = 13663312. Its totient is φ = 10247472.

The previous prime is 11955373. The next prime is 11955397. The reversal of 11955391 is 19355911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11955391 - 2¹¹ = 11953343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11955397) 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, 853950 + ... + 853963.

It is an arithmetic number, because the mean of its divisors is an integer number (3415828).

Almost surely, 2^11955391 is an apocalyptic number.

11955391 is a deficient number, since it is larger than the sum of its proper divisors (1707921).

11955391 is an equidigital number, since it uses as much as digits as its factorization.

11955391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707920.

The product of its digits is 6075, while the sum is 34.

The square root of 11955391 is about 3457.6568655666. The cubic root of 11955391 is about 228.6588042622.

The spelling of 11955391 in words is "eleven million, nine hundred fifty-five thousand, three hundred ninety-one".