1618201 has 4 divisors (see below), whose sum is σ = 1742692. Its totient is φ = 1493712.

The previous prime is 1618189. The next prime is 1618207. The reversal of 1618201 is 1028161.

1618201 = 899² + 900².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1028161 = 347 ⋅2963.

It can be written as a sum of positive squares in 2 ways, for example, as 810000 + 808201 = 900^2 + 899^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618201 - 2⁹ = 1617689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1618207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62226 + ... + 62251.

It is an arithmetic number, because the mean of its divisors is an integer number (435673).

2^1618201 is an apocalyptic number.

1618201 is the 900-th centered square number.

It is an amenable number.

1618201 is a deficient number, since it is larger than the sum of its proper divisors (124491).

1618201 is a wasteful number, since it uses less digits than its factorization.

1618201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124490.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1618201 is about 1272.0852958823. The cubic root of 1618201 is about 117.4025387690.

The spelling of 1618201 in words is "one million, six hundred eighteen thousand, two hundred one".