91398673 has 2 divisors, whose sum is σ = 91398674. Its totient is φ = 91398672.

The previous prime is 91398667. The next prime is 91398689. The reversal of 91398673 is 37689319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63170704 + 28227969 = 7948^2 + 5313^2 .

It is an emirp because it is prime and its reverse (37689319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91398673 - 2⁵ = 91398641 is a prime.

It is not a weakly prime, because it can be changed into another prime (91398623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45699336 + 45699337.

It is an arithmetic number, because the mean of its divisors is an integer number (45699337).

Almost surely, 2^91398673 is an apocalyptic number.

It is an amenable number.

91398673 is a deficient number, since it is larger than the sum of its proper divisors (1).

91398673 is an equidigital number, since it uses as much as digits as its factorization.

91398673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 91398673 is about 9560.2653205860. The cubic root of 91398673 is about 450.4500403043.

The spelling of 91398673 in words is "ninety-one million, three hundred ninety-eight thousand, six hundred seventy-three".