12155515 has 8 divisors (see below), whose sum is σ = 14607648. Its totient is φ = 9710400.

The previous prime is 12155509. The next prime is 12155519. The reversal of 12155515 is 51555121.

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

It is not a de Polignac number, because 12155515 - 2⁷ = 12155387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12155515.

It is not an unprimeable number, because it can be changed into a prime (12155519) 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, 3490 + ... + 6040.

It is an arithmetic number, because the mean of its divisors is an integer number (1825956).

Almost surely, 2^12155515 is an apocalyptic number.

12155515 is a deficient number, since it is larger than the sum of its proper divisors (2452133).

12155515 is an equidigital number, since it uses as much as digits as its factorization.

12155515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3509.

The product of its digits is 1250, while the sum is 25.

The square root of 12155515 is about 3486.4760145453. The cubic root of 12155515 is about 229.9276079670.

The spelling of 12155515 in words is "twelve million, one hundred fifty-five thousand, five hundred fifteen".