91371223 has 2 divisors, whose sum is σ = 91371224. Its totient is φ = 91371222.

The previous prime is 91371221. The next prime is 91371251. The reversal of 91371223 is 32217319.

It is an a-pointer prime, because the next prime (91371251) can be obtained adding 91371223 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91371223 - 2¹ = 91371221 is a prime.

Together with 91371221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 91371191 and 91371200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91371221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45685611 + 45685612.

It is an arithmetic number, because the mean of its divisors is an integer number (45685612).

Almost surely, 2^91371223 is an apocalyptic number.

91371223 is a deficient number, since it is larger than the sum of its proper divisors (1).

91371223 is an equidigital number, since it uses as much as digits as its factorization.

91371223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 28.

The square root of 91371223 is about 9558.8295831655. The cubic root of 91371223 is about 450.4049408470.

The spelling of 91371223 in words is "ninety-one million, three hundred seventy-one thousand, two hundred twenty-three".