11491801 has 4 divisors (see below), whose sum is σ = 11888100. Its totient is φ = 11095504.

The previous prime is 11491787. The next prime is 11491807. The reversal of 11491801 is 10819411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10819411 = 113 ⋅95747.

It can be written as a sum of positive squares in 2 ways, for example, as 3426201 + 8065600 = 1851^2 + 2840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11491801 is a prime.

It is a super-2 number, since 2×11491801² = 264122980447202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11491807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198106 + ... + 198163.

It is an arithmetic number, because the mean of its divisors is an integer number (2972025).

Almost surely, 2^11491801 is an apocalyptic number.

It is an amenable number.

11491801 is a deficient number, since it is larger than the sum of its proper divisors (396299).

11491801 is an equidigital number, since it uses as much as digits as its factorization.

11491801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396298.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 11491801 is about 3389.9558994182. The cubic root of 11491801 is about 225.6642166775.

The spelling of 11491801 in words is "eleven million, four hundred ninety-one thousand, eight hundred one".