12171154 has 4 divisors (see below), whose sum is σ = 18256734. Its totient is φ = 6085576.

The previous prime is 12171151. The next prime is 12171161. The reversal of 12171154 is 45117121.

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

It can be written as a sum of positive squares in only one way, i.e., 9753129 + 2418025 = 3123^2 + 1555^2 .

It is not an unprimeable number, because it can be changed into a prime (12171151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3042787 + ... + 3042790.

Almost surely, 2^12171154 is an apocalyptic number.

12171154 is a deficient number, since it is larger than the sum of its proper divisors (6085580).

12171154 is an equidigital number, since it uses as much as digits as its factorization.

12171154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6085579.

The product of its digits is 280, while the sum is 22.

The square root of 12171154 is about 3488.7181026847. The cubic root of 12171154 is about 230.0261721950.

Adding to 12171154 its reverse (45117121), we get a palindrome (57288275).

The spelling of 12171154 in words is "twelve million, one hundred seventy-one thousand, one hundred fifty-four".