12015671 has 4 divisors (see below), whose sum is σ = 12132432. Its totient is φ = 11898912.

The previous prime is 12015659. The next prime is 12015677. The reversal of 12015671 is 17651021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17651021 = 61 ⋅289361.

It is a cyclic number.

It is not a de Polignac number, because 12015671 - 2¹⁸ = 11753527 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 (12015677) 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, 58226 + ... + 58431.

It is an arithmetic number, because the mean of its divisors is an integer number (3033108).

Almost surely, 2^12015671 is an apocalyptic number.

12015671 is a deficient number, since it is larger than the sum of its proper divisors (116761).

12015671 is a wasteful number, since it uses less digits than its factorization.

12015671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116760.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 12015671 is about 3466.3627911689. The cubic root of 12015671 is about 229.0424652534.

Adding to 12015671 its reverse (17651021), we get a palindrome (29666692).

The spelling of 12015671 in words is "twelve million, fifteen thousand, six hundred seventy-one".