825237991 has 2 divisors, whose sum is σ = 825237992. Its totient is φ = 825237990.

The previous prime is 825237979. The next prime is 825238027. The reversal of 825237991 is 199732528.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 825237991 - 2⁷ = 825237863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825237901) 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, 412618995 + 412618996.

It is an arithmetic number, because the mean of its divisors is an integer number (412618996).

Almost surely, 2^825237991 is an apocalyptic number.

825237991 is a deficient number, since it is larger than the sum of its proper divisors (1).

825237991 is an equidigital number, since it uses as much as digits as its factorization.

825237991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 825237991 is about 28726.9558254960. The cubic root of 825237991 is about 937.9789044981.

The spelling of 825237991 in words is "eight hundred twenty-five million, two hundred thirty-seven thousand, nine hundred ninety-one".