91306223 has 2 divisors, whose sum is σ = 91306224. Its totient is φ = 91306222.

The previous prime is 91306219. The next prime is 91306231. The reversal of 91306223 is 32260319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91306223 - 2² = 91306219 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91306192 and 91306201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91306273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45653111 + 45653112.

It is an arithmetic number, because the mean of its divisors is an integer number (45653112).

Almost surely, 2^91306223 is an apocalyptic number.

91306223 is a deficient number, since it is larger than the sum of its proper divisors (1).

91306223 is an equidigital number, since it uses as much as digits as its factorization.

91306223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 91306223 is about 9555.4289804278. The cubic root of 91306223 is about 450.2981119309.

The spelling of 91306223 in words is "ninety-one million, three hundred six thousand, two hundred twenty-three".