1861241 has 4 divisors (see below), whose sum is σ = 1866084. Its totient is φ = 1856400.

The previous prime is 1861219. The next prime is 1861253. The reversal of 1861241 is 1421681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1421681 = 1009 ⋅1409.

It can be written as a sum of positive squares in 2 ways, for example, as 606841 + 1254400 = 779^2 + 1120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1861241 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, 1790 + ... + 2631.

It is an arithmetic number, because the mean of its divisors is an integer number (466521).

2^1861241 is an apocalyptic number.

It is an amenable number.

1861241 is a deficient number, since it is larger than the sum of its proper divisors (4843).

1861241 is an equidigital number, since it uses as much as digits as its factorization.

1861241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4842.

The product of its digits is 384, while the sum is 23.

The square root of 1861241 is about 1364.2730665083. The cubic root of 1861241 is about 123.0082396930.

The spelling of 1861241 in words is "one million, eight hundred sixty-one thousand, two hundred forty-one".