11531215 has 8 divisors (see below), whose sum is σ = 14132160. Its totient is φ = 9028512.

The previous prime is 11531207. The next prime is 11531231. The reversal of 11531215 is 51213511.

11531215 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11531215 - 2³ = 11531207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11531192 and 11531201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24300 + ... + 24769.

It is an arithmetic number, because the mean of its divisors is an integer number (1766520).

Almost surely, 2^11531215 is an apocalyptic number.

11531215 is a deficient number, since it is larger than the sum of its proper divisors (2600945).

11531215 is an equidigital number, since it uses as much as digits as its factorization.

11531215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49121.

The product of its digits is 150, while the sum is 19.

The square root of 11531215 is about 3395.7642733264. The cubic root of 11531215 is about 225.9219128769.

Adding to 11531215 its reverse (51213511), we get a palindrome (62744726).

The spelling of 11531215 in words is "eleven million, five hundred thirty-one thousand, two hundred fifteen".