11891801 has 2 divisors, whose sum is σ = 11891802. Its totient is φ = 11891800.

The previous prime is 11891797. The next prime is 11891813. The reversal of 11891801 is 10819811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8128201 + 3763600 = 2851^2 + 1940^2 .

It is a cyclic number.

It is not a de Polignac number, because 11891801 - 2² = 11891797 is a prime.

It is not a weakly prime, because it can be changed into another prime (11891821) 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 as a sum of consecutive naturals, namely, 5945900 + 5945901.

It is an arithmetic number, because the mean of its divisors is an integer number (5945901).

Almost surely, 2^11891801 is an apocalyptic number.

It is an amenable number.

11891801 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891801 is an equidigital number, since it uses as much as digits as its factorization.

11891801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 11891801 is about 3448.4490716843. The cubic root of 11891801 is about 228.2526759119.

It can be divided in two parts, 118 and 91801, that added together give a palindrome (91919).

The spelling of 11891801 in words is "eleven million, eight hundred ninety-one thousand, eight hundred one".