91279373 has 2 divisors, whose sum is σ = 91279374. Its totient is φ = 91279372.

The previous prime is 91279369. The next prime is 91279403. The reversal of 91279373 is 37397219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86359849 + 4919524 = 9293^2 + 2218^2 .

It is an emirp because it is prime and its reverse (37397219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91279373 - 2² = 91279369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91279373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91279343) 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, 45639686 + 45639687.

It is an arithmetic number, because the mean of its divisors is an integer number (45639687).

Almost surely, 2^91279373 is an apocalyptic number.

It is an amenable number.

91279373 is a deficient number, since it is larger than the sum of its proper divisors (1).

91279373 is an equidigital number, since it uses as much as digits as its factorization.

91279373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 41.

The square root of 91279373 is about 9554.0239166542. The cubic root of 91279373 is about 450.2539685738.

The spelling of 91279373 in words is "ninety-one million, two hundred seventy-nine thousand, three hundred seventy-three".