1218151 has 16 divisors (see below), whose sum is σ = 1417248. Its totient is φ = 1036800.

The previous prime is 1218131. The next prime is 1218157. The reversal of 1218151 is 1518121.

It is a happy number.

It is a 9-Lehmer number, since φ(1218151) divides (1218151-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 1218151 - 2¹³ = 1209959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16651 + ... + 16723.

It is an arithmetic number, because the mean of its divisors is an integer number (88578).

2^1218151 is an apocalyptic number.

1218151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1218151 is a deficient number, since it is larger than the sum of its proper divisors (199097).

1218151 is a wasteful number, since it uses less digits than its factorization.

1218151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162.

The product of its digits is 80, while the sum is 19.

The square root of 1218151 is about 1103.6987813711. The cubic root of 1218151 is about 106.7989645333.

It can be divided in two parts, 1218 and 151, that added together give a square (1369 = 37²).

The spelling of 1218151 in words is "one million, two hundred eighteen thousand, one hundred fifty-one".