11955691 has 4 divisors (see below), whose sum is σ = 13042584. Its totient is φ = 10868800.

The previous prime is 11955689. The next prime is 11955703. The reversal of 11955691 is 19655911.

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 11955691 - 2¹ = 11955689 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 11955691.

It is not an unprimeable number, because it can be changed into a prime (11955091) 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, 543430 + ... + 543451.

It is an arithmetic number, because the mean of its divisors is an integer number (3260646).

Almost surely, 2^11955691 is an apocalyptic number.

11955691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11955691 is a deficient number, since it is larger than the sum of its proper divisors (1086893).

11955691 is a wasteful number, since it uses less digits than its factorization.

11955691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086892.

The product of its digits is 12150, while the sum is 37.

The square root of 11955691 is about 3457.7002472742. The cubic root of 11955691 is about 228.6607168461.

It can be divided in two parts, 1195 and 5691, that added together give a palindrome (6886).

The spelling of 11955691 in words is "eleven million, nine hundred fifty-five thousand, six hundred ninety-one".