12171087 has 16 divisors (see below), whose sum is σ = 18096480. Its totient is φ = 8084736.

The previous prime is 12171067. The next prime is 12171101. The reversal of 12171087 is 78017121.

It is not a de Polignac number, because 12171087 - 2⁶ = 12171023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 12171087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12171067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8893 + ... + 10169.

It is an arithmetic number, because the mean of its divisors is an integer number (1131030).

Almost surely, 2^12171087 is an apocalyptic number.

12171087 is a deficient number, since it is larger than the sum of its proper divisors (5925393).

12171087 is a wasteful number, since it uses less digits than its factorization.

12171087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 12171087 is about 3488.7085002906. The cubic root of 12171087 is about 230.0257501101.

It can be divided in two parts, 1217 and 1087, that added together give a square (2304 = 48²).

The spelling of 12171087 in words is "twelve million, one hundred seventy-one thousand, eighty-seven".