1218161 has 8 divisors (see below), whose sum is σ = 1406784. Its totient is φ = 1033200.

The previous prime is 1218157. The next prime is 1218167. The reversal of 1218161 is 1618121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1218161 - 2² = 1218157 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155 + ... + 1568.

It is an arithmetic number, because the mean of its divisors is an integer number (175848).

2^1218161 is an apocalyptic number.

It is an amenable number.

1218161 is a deficient number, since it is larger than the sum of its proper divisors (188623).

1218161 is a wasteful number, since it uses less digits than its factorization.

1218161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831.

The product of its digits is 96, while the sum is 20.

The square root of 1218161 is about 1103.7033115833. The cubic root of 1218161 is about 106.7992567759.

The spelling of 1218161 in words is "one million, two hundred eighteen thousand, one hundred sixty-one".