1891201 has 4 divisors (see below), whose sum is σ = 2036692. Its totient is φ = 1745712.

The previous prime is 1891189. The next prime is 1891213. The reversal of 1891201 is 1021981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1021981 = 43 ⋅23767.

It is an interprime number because it is at equal distance from previous prime (1891189) and next prime (1891213).

It can be written as a sum of positive squares in 2 ways, for example, as 303601 + 1587600 = 551^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1891201 - 2⁷ = 1891073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891291) 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 3 ways as a sum of consecutive naturals, for example, 72726 + ... + 72751.

It is an arithmetic number, because the mean of its divisors is an integer number (509173).

2^1891201 is an apocalyptic number.

It is an amenable number.

1891201 is a deficient number, since it is larger than the sum of its proper divisors (145491).

1891201 is a wasteful number, since it uses less digits than its factorization.

1891201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145490.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1891201 is about 1375.2094385947. The cubic root of 1891201 is about 123.6647421455.

It can be divided in two parts, 18 and 91201, that added together give a palindrome (91219).

The spelling of 1891201 in words is "one million, eight hundred ninety-one thousand, two hundred one".