11971599 has 8 divisors (see below), whose sum is σ = 15980592. Its totient is φ = 7971840.

The previous prime is 11971567. The next prime is 11971607. The reversal of 11971599 is 99517911.

It is a happy number.

It is a Cunningham number, because it is equal to 3460²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11971599 - 2⁵ = 11971567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11971599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11971529) 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 7 ways as a sum of consecutive naturals, for example, 1729 + ... + 5189.

It is an arithmetic number, because the mean of its divisors is an integer number (1997574).

Almost surely, 2^11971599 is an apocalyptic number.

11971599 is a deficient number, since it is larger than the sum of its proper divisors (4008993).

11971599 is a wasteful number, since it uses less digits than its factorization.

11971599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4617.

The product of its digits is 25515, while the sum is 42.

The square root of 11971599 is about 3459.9998554913. Note that the first 3 decimals coincide. The cubic root of 11971599 is about 228.7620890025.

The spelling of 11971599 in words is "eleven million, nine hundred seventy-one thousand, five hundred ninety-nine".