825288391 has 2 divisors, whose sum is σ = 825288392. Its totient is φ = 825288390.

The previous prime is 825288329. The next prime is 825288407. The reversal of 825288391 is 193882528.

825288391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 825288391 - 2⁷ = 825288263 is a prime.

It is a super-2 number, since 2×825288391² = 1362201856638737762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825288301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412644195 + 412644196.

It is an arithmetic number, because the mean of its divisors is an integer number (412644196).

Almost surely, 2^825288391 is an apocalyptic number.

825288391 is a deficient number, since it is larger than the sum of its proper divisors (1).

825288391 is an equidigital number, since it uses as much as digits as its factorization.

825288391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The square root of 825288391 is about 28727.8330369696. The cubic root of 825288391 is about 937.9979992623.

The spelling of 825288391 in words is "eight hundred twenty-five million, two hundred eighty-eight thousand, three hundred ninety-one".