1618121 has 8 divisors (see below), whose sum is σ = 1682184. Its totient is φ = 1555200.

The previous prime is 1618093. The next prime is 1618129. The reversal of 1618121 is 1218161.

It can be written as a sum of positive squares in 4 ways, for example, as 657721 + 960400 = 811^2 + 980^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618121 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1618093 and 1618102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618129) 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, 3521 + ... + 3953.

It is an arithmetic number, because the mean of its divisors is an integer number (210273).

2^1618121 is an apocalyptic number.

It is an amenable number.

1618121 is a deficient number, since it is larger than the sum of its proper divisors (64063).

1618121 is a wasteful number, since it uses less digits than its factorization.

1618121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571.

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

The square root of 1618121 is about 1272.0538510613. The cubic root of 1618121 is about 117.4006040365.

The spelling of 1618121 in words is "one million, six hundred eighteen thousand, one hundred twenty-one".