11215801 has 9 divisors (see below), whose sum is σ = 11975149. Its totient is φ = 10502464.

The previous prime is 11215781. The next prime is 11215811. The reversal of 11215801 is 10851211.

It is a happy number.

The square root of 11215801 is 3349.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 7295401 + 3920400 = 2701^2 + 1980^2 .

It is not a de Polignac number, because 11215801 - 2⁹ = 11215289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11215811) 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 in 8 ways as a sum of consecutive naturals, for example, 56835 + ... + 57031.

Almost surely, 2^11215801 is an apocalyptic number.

11215801 is the 3349-th square number.

11215801 is the 1675-th centered octagonal number.

It is an amenable number.

11215801 is a deficient number, since it is larger than the sum of its proper divisors (759348).

11215801 is an frugal number, since it uses more digits than its factorization.

11215801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 19.

The cubic root of 11215801 is about 223.8429556653.

The spelling of 11215801 in words is "eleven million, two hundred fifteen thousand, eight hundred one".