1925825621 has 2 divisors, whose sum is σ = 1925825622. Its totient is φ = 1925825620.

The previous prime is 1925825599. The next prime is 1925825623. The reversal of 1925825621 is 1265285291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971880625 + 953944996 = 31175^2 + 30886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1925825621 - 2⁶ = 1925825557 is a prime.

Together with 1925825623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1925825623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 962912810 + 962912811.

It is an arithmetic number, because the mean of its divisors is an integer number (962912811).

Almost surely, 2^1925825621 is an apocalyptic number.

It is an amenable number.

1925825621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1925825621 is an equidigital number, since it uses as much as digits as its factorization.

1925825621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 41.

The square root of 1925825621 is about 43884.2297528395. The cubic root of 1925825621 is about 1244.1487858507.

The spelling of 1925825621 in words is "one billion, nine hundred twenty-five million, eight hundred twenty-five thousand, six hundred twenty-one".