12271545 has 48 divisors (see below), whose sum is σ = 25002432. Its totient is φ = 5489280.

The previous prime is 12271541. The next prime is 12271561. The reversal of 12271545 is 54517221.

It is not a de Polignac number, because 12271545 - 2² = 12271541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12271541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5482 + ... + 7388.

It is an arithmetic number, because the mean of its divisors is an integer number (520884).

It is a vampire number, since it can be written as 2145 ⋅ 5721 (with its own digits).

Almost surely, 2^12271545 is an apocalyptic number.

12271545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12271545 is an abundant number, since it is smaller than the sum of its proper divisors (12730887).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12271545 is a wasteful number, since it uses less digits than its factorization.

12271545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942 (or 1939 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 12271545 is about 3503.0765050167. The cubic root of 12271545 is about 230.6568808242.

Adding to 12271545 its reverse (54517221), we get a palindrome (66788766).

It can be divided in two parts, 122715 and 45, that added together give a triangular number (122760 = T₄₉₅).

The spelling of 12271545 in words is "twelve million, two hundred seventy-one thousand, five hundred forty-five".