91031323 has 2 divisors, whose sum is σ = 91031324. Its totient is φ = 91031322.

The previous prime is 91031321. The next prime is 91031363. The reversal of 91031323 is 32313019.

It is a weak prime.

It is an emirp because it is prime and its reverse (32313019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91031323 - 2¹ = 91031321 is a prime.

Together with 91031321, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 91031294 and 91031303.

It is not a weakly prime, because it can be changed into another prime (91031321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45515661 + 45515662.

It is an arithmetic number, because the mean of its divisors is an integer number (45515662).

Almost surely, 2^91031323 is an apocalyptic number.

91031323 is a deficient number, since it is larger than the sum of its proper divisors (1).

91031323 is an equidigital number, since it uses as much as digits as its factorization.

91031323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 91031323 is about 9541.0336442128. The cubic root of 91031323 is about 449.8457463070.

The spelling of 91031323 in words is "ninety-one million, thirty-one thousand, three hundred twenty-three".