91641439 has 2 divisors, whose sum is σ = 91641440. Its totient is φ = 91641438.

The previous prime is 91641413. The next prime is 91641481. The reversal of 91641439 is 93414619.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91641439 - 2⁷ = 91641311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91641398 and 91641407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91641409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45820719 + 45820720.

It is an arithmetic number, because the mean of its divisors is an integer number (45820720).

Almost surely, 2^91641439 is an apocalyptic number.

91641439 is a deficient number, since it is larger than the sum of its proper divisors (1).

91641439 is an equidigital number, since it uses as much as digits as its factorization.

91641439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 91641439 is about 9572.9535149817. The cubic root of 91641439 is about 450.8485044336.

The spelling of 91641439 in words is "ninety-one million, six hundred forty-one thousand, four hundred thirty-nine".