1218042171 has 16 divisors (see below), whose sum is σ = 1805107200. Its totient is φ = 811758024.

The previous prime is 1218042169. The next prime is 1218042193. The reversal of 1218042171 is 1712408121.

It is not a de Polignac number, because 1218042171 - 2¹ = 1218042169 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1218042121) 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, 106870 + ... + 117716.

It is an arithmetic number, because the mean of its divisors is an integer number (112819200).

Almost surely, 2^1218042171 is an apocalyptic number.

1218042171 is a deficient number, since it is larger than the sum of its proper divisors (587065029).

1218042171 is a wasteful number, since it uses less digits than its factorization.

1218042171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15015 (or 15009 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1218042171 is about 34900.4608995354. The cubic root of 1218042171 is about 1067.9578398330.

The spelling of 1218042171 in words is "one billion, two hundred eighteen million, forty-two thousand, one hundred seventy-one".