91825807 has 2 divisors, whose sum is σ = 91825808. Its totient is φ = 91825806.

The previous prime is 91825753. The next prime is 91825847. The reversal of 91825807 is 70852819.

It is an a-pointer prime, because the next prime (91825847) can be obtained adding 91825807 to its sum of digits (40).

It is a strong prime.

It is an emirp because it is prime and its reverse (70852819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91825807 - 2¹⁹ = 91301519 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91825807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91825847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45912903 + 45912904.

It is an arithmetic number, because the mean of its divisors is an integer number (45912904).

Almost surely, 2^91825807 is an apocalyptic number.

91825807 is a deficient number, since it is larger than the sum of its proper divisors (1).

91825807 is an equidigital number, since it uses as much as digits as its factorization.

91825807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 91825807 is about 9582.5783064893. The cubic root of 91825807 is about 451.1506470648.

The spelling of 91825807 in words is "ninety-one million, eight hundred twenty-five thousand, eight hundred seven".