825020551 has 2 divisors, whose sum is σ = 825020552. Its totient is φ = 825020550.

The previous prime is 825020549. The next prime is 825020671. The reversal of 825020551 is 155020528.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 825020551 - 2¹ = 825020549 is a prime.

Together with 825020549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825020531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412510275 + 412510276.

It is an arithmetic number, because the mean of its divisors is an integer number (412510276).

Almost surely, 2^825020551 is an apocalyptic number.

825020551 is a deficient number, since it is larger than the sum of its proper divisors (1).

825020551 is an equidigital number, since it uses as much as digits as its factorization.

825020551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 825020551 is about 28723.1709774530. The cubic root of 825020551 is about 937.8965153163.

The spelling of 825020551 in words is "eight hundred twenty-five million, twenty thousand, five hundred fifty-one".