1825861 has 2 divisors, whose sum is σ = 1825862. Its totient is φ = 1825860.

The previous prime is 1825829. The next prime is 1825867. The reversal of 1825861 is 1685281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1640961 + 184900 = 1281^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1825861 - 2⁵ = 1825829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1825867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 912930 + 912931.

It is an arithmetic number, because the mean of its divisors is an integer number (912931).

2^1825861 is an apocalyptic number.

It is an amenable number.

1825861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1825861 is an equidigital number, since it uses as much as digits as its factorization.

1825861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 31.

The square root of 1825861 is about 1351.2442414308. The cubic root of 1825861 is about 122.2238343528.

The spelling of 1825861 in words is "one million, eight hundred twenty-five thousand, eight hundred sixty-one".