91366439 has 2 divisors, whose sum is σ = 91366440. Its totient is φ = 91366438.

The previous prime is 91366411. The next prime is 91366441. The reversal of 91366439 is 93466319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91366439 - 2⁸ = 91366183 is a prime.

Together with 91366441, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91366396 and 91366405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91366469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45683219 + 45683220.

It is an arithmetic number, because the mean of its divisors is an integer number (45683220).

Almost surely, 2^91366439 is an apocalyptic number.

91366439 is a deficient number, since it is larger than the sum of its proper divisors (1).

91366439 is an equidigital number, since it uses as much as digits as its factorization.

91366439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 41.

The square root of 91366439 is about 9558.5793400484. The cubic root of 91366439 is about 450.3970799663.

The spelling of 91366439 in words is "ninety-one million, three hundred sixty-six thousand, four hundred thirty-nine".