91964447 has 2 divisors, whose sum is σ = 91964448. Its totient is φ = 91964446.

The previous prime is 91964417. The next prime is 91964449. The reversal of 91964447 is 74446919.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91964447 is a prime.

It is a super-3 number, since 3×91964447³ (a number of 25 digits) contains 333 as substring.

Together with 91964449, 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 = 91964398 and 91964407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91964449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45982223 + 45982224.

It is an arithmetic number, because the mean of its divisors is an integer number (45982224).

Almost surely, 2^91964447 is an apocalyptic number.

91964447 is a deficient number, since it is larger than the sum of its proper divisors (1).

91964447 is an equidigital number, since it uses as much as digits as its factorization.

91964447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 91964447 is about 9589.8095392974. The cubic root of 91964447 is about 451.3775842615.

The spelling of 91964447 in words is "ninety-one million, nine hundred sixty-four thousand, four hundred forty-seven".