12155671 has 4 divisors (see below), whose sum is σ = 13260744. Its totient is φ = 11050600.

The previous prime is 12155641. The next prime is 12155677. The reversal of 12155671 is 17655121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12155671 - 2⁹ = 12155159 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 (12155677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552520 + ... + 552541.

It is an arithmetic number, because the mean of its divisors is an integer number (3315186).

Almost surely, 2^12155671 is an apocalyptic number.

12155671 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12155671 is a deficient number, since it is larger than the sum of its proper divisors (1105073).

12155671 is a wasteful number, since it uses less digits than its factorization.

12155671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105072.

The product of its digits is 2100, while the sum is 28.

The square root of 12155671 is about 3486.4983866338. The cubic root of 12155671 is about 229.9285915686.

It can be divided in two parts, 1215 and 5671, that added together give a palindrome (6886).

The spelling of 12155671 in words is "twelve million, one hundred fifty-five thousand, six hundred seventy-one".