1825661 has 2 divisors, whose sum is σ = 1825662. Its totient is φ = 1825660.

The previous prime is 1825631. The next prime is 1825667. The reversal of 1825661 is 1665281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 109561 = 1310^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1825661 - 2⁶ = 1825597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1825667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 912830 + 912831.

It is an arithmetic number, because the mean of its divisors is an integer number (912831).

2^1825661 is an apocalyptic number.

It is an amenable number.

1825661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1825661 is an equidigital number, since it uses as much as digits as its factorization.

1825661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 1825661 is about 1351.1702335383. The cubic root of 1825661 is about 122.2193714976.

The spelling of 1825661 in words is "one million, eight hundred twenty-five thousand, six hundred sixty-one".