1861201 has 4 divisors (see below), whose sum is σ = 1896372. Its totient is φ = 1826032.

The previous prime is 1861187. The next prime is 1861219. The reversal of 1861201 is 1021681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 456976 + 1404225 = 676^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861201 - 2¹⁵ = 1828433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861261) 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, 17506 + ... + 17611.

It is an arithmetic number, because the mean of its divisors is an integer number (474093).

2^1861201 is an apocalyptic number.

It is an amenable number.

1861201 is a deficient number, since it is larger than the sum of its proper divisors (35171).

1861201 is an equidigital number, since it uses as much as digits as its factorization.

1861201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35170.

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

The square root of 1861201 is about 1364.2584066078. The cubic root of 1861201 is about 123.0073584951.

Adding to 1861201 its reverse (1021681), we get a palindrome (2882882).

The spelling of 1861201 in words is "one million, eight hundred sixty-one thousand, two hundred one".