12191515 has 16 divisors (see below), whose sum is σ = 16853760. Its totient is φ = 8292960.

The previous prime is 12191507. The next prime is 12191563. The reversal of 12191515 is 51519121.

It is a happy number.

12191515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12191515 - 2³ = 12191507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12191515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3256 + ... + 5914.

It is an arithmetic number, because the mean of its divisors is an integer number (1053360).

Almost surely, 2^12191515 is an apocalyptic number.

12191515 is a deficient number, since it is larger than the sum of its proper divisors (4662245).

12191515 is a wasteful number, since it uses less digits than its factorization.

12191515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802.

The product of its digits is 450, while the sum is 25.

The square root of 12191515 is about 3491.6350038342. The cubic root of 12191515 is about 230.1543702174.

The spelling of 12191515 in words is "twelve million, one hundred ninety-one thousand, five hundred fifteen".