11515989 has 8 divisors (see below), whose sum is σ = 15375040. Its totient is φ = 7667136.

The previous prime is 11515961. The next prime is 11515997. The reversal of 11515989 is 98951511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11515989 - 2¹² = 11511893 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 (11515949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669 + ... + 4845.

It is an arithmetic number, because the mean of its divisors is an integer number (1921880).

Almost surely, 2^11515989 is an apocalyptic number.

It is an amenable number.

11515989 is a deficient number, since it is larger than the sum of its proper divisors (3859051).

11515989 is an equidigital number, since it uses as much as digits as its factorization.

11515989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5099.

The product of its digits is 16200, while the sum is 39.

The square root of 11515989 is about 3393.5216221501. The cubic root of 11515989 is about 225.8224321144.

It can be divided in two parts, 1151 and 5989, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 11515989 in words is "eleven million, five hundred fifteen thousand, nine hundred eighty-nine".