11501989 has 4 divisors (see below), whose sum is σ = 11509056. Its totient is φ = 11494924.

The previous prime is 11501881. The next prime is 11502019. The reversal of 11501989 is 98910511.

11501989 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11501989 - 2¹⁵ = 11469221 is a prime.

It is a super-2 number, since 2×11501989² = 264591501912242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11502989) 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, 282 + ... + 4804.

It is an arithmetic number, because the mean of its divisors is an integer number (2877264).

Almost surely, 2^11501989 is an apocalyptic number.

It is an amenable number.

11501989 is a deficient number, since it is larger than the sum of its proper divisors (7067).

11501989 is an equidigital number, since it uses as much as digits as its factorization.

11501989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 11501989 is about 3391.4582409341. The cubic root of 11501989 is about 225.7308841495.

The spelling of 11501989 in words is "eleven million, five hundred one thousand, nine hundred eighty-nine".