11971801 has 2 divisors, whose sum is σ = 11971802. Its totient is φ = 11971800.

The previous prime is 11971787. The next prime is 11971811. The reversal of 11971801 is 10817911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8856576 + 3115225 = 2976^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 11971801 - 2⁵ = 11971769 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11971801.

It is not a weakly prime, because it can be changed into another prime (11971811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5985900 + 5985901.

It is an arithmetic number, because the mean of its divisors is an integer number (5985901).

Almost surely, 2^11971801 is an apocalyptic number.

It is an amenable number.

11971801 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971801 is an equidigital number, since it uses as much as digits as its factorization.

11971801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 11971801 is about 3460.0290461209. The cubic root of 11971801 is about 228.7633756499.

The spelling of 11971801 in words is "eleven million, nine hundred seventy-one thousand, eight hundred one".