1825621841 has 2 divisors, whose sum is σ = 1825621842. Its totient is φ = 1825621840.

The previous prime is 1825621813. The next prime is 1825621843. The reversal of 1825621841 is 1481265281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1226400400 + 599221441 = 35020^2 + 24479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1825621841 is a prime.

Together with 1825621843, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1825621795 and 1825621804.

It is not a weakly prime, because it can be changed into another prime (1825621843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 912810920 + 912810921.

It is an arithmetic number, because the mean of its divisors is an integer number (912810921).

Almost surely, 2^1825621841 is an apocalyptic number.

It is an amenable number.

1825621841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1825621841 is an equidigital number, since it uses as much as digits as its factorization.

1825621841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 38.

The square root of 1825621841 is about 42727.2962051193. The cubic root of 1825621841 is about 1222.1849765476.

The spelling of 1825621841 in words is "one billion, eight hundred twenty-five million, six hundred twenty-one thousand, eight hundred forty-one".