11213989 has 4 divisors (see below), whose sum is σ = 11252556. Its totient is φ = 11175424.

The previous prime is 11213987. The next prime is 11214023. The reversal of 11213989 is 98931211.

11213989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10349089 + 864900 = 3217^2 + 930^2 .

It is a cyclic number.

It is not a de Polignac number, because 11213989 - 2¹ = 11213987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213987) 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, 18844 + ... + 19429.

It is an arithmetic number, because the mean of its divisors is an integer number (2813139).

Almost surely, 2^11213989 is an apocalyptic number.

It is an amenable number.

11213989 is a deficient number, since it is larger than the sum of its proper divisors (38567).

11213989 is an equidigital number, since it uses as much as digits as its factorization.

11213989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38566.

The product of its digits is 3888, while the sum is 34.

The square root of 11213989 is about 3348.7294605566. The cubic root of 11213989 is about 223.8309004918.

The spelling of 11213989 in words is "eleven million, two hundred thirteen thousand, nine hundred eighty-nine".