11901001 has 4 divisors (see below), whose sum is σ = 13601152. Its totient is φ = 10200852.

The previous prime is 11900989. The next prime is 11901007. The reversal of 11901001 is 10010911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10010911 = 23 ⋅435257.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11901001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11901007) 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, 850065 + ... + 850078.

It is an arithmetic number, because the mean of its divisors is an integer number (3400288).

Almost surely, 2^11901001 is an apocalyptic number.

It is an amenable number.

11901001 is a deficient number, since it is larger than the sum of its proper divisors (1700151).

11901001 is an equidigital number, since it uses as much as digits as its factorization.

11901001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700150.

The product of its (nonzero) digits is 9, while the sum is 13.

The square root of 11901001 is about 3449.7827467828. The cubic root of 11901001 is about 228.3115227123.

Adding to 11901001 its reverse (10010911), we get a palindrome (21911912).

The spelling of 11901001 in words is "eleven million, nine hundred one thousand, one".