11971601 has 4 divisors (see below), whose sum is σ = 11993652. Its totient is φ = 11949552.

The previous prime is 11971567. The next prime is 11971607. The reversal of 11971601 is 10617911.

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

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

It can be written as a sum of positive squares in 2 ways, for example, as 1048576 + 10923025 = 1024^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 11971601 - 2⁶ = 11971537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11971607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10190 + ... + 11303.

It is an arithmetic number, because the mean of its divisors is an integer number (2998413).

Almost surely, 2^11971601 is an apocalyptic number.

It is an amenable number.

11971601 is a deficient number, since it is larger than the sum of its proper divisors (22051).

11971601 is an equidigital number, since it uses as much as digits as its factorization.

11971601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22050.

The product of its (nonzero) digits is 378, while the sum is 26.

The square root of 11971601 is about 3460.0001445087. Note that the first 3 decimals coincide. The cubic root of 11971601 is about 228.7621017416.

The spelling of 11971601 in words is "eleven million, nine hundred seventy-one thousand, six hundred one".