91005263 has 2 divisors, whose sum is σ = 91005264. Its totient is φ = 91005262.

The previous prime is 91005253. The next prime is 91005289. The reversal of 91005263 is 36250019.

It is an a-pointer prime, because the next prime (91005289) can be obtained adding 91005263 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91005263 - 2⁴ = 91005247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91005253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45502631 + 45502632.

It is an arithmetic number, because the mean of its divisors is an integer number (45502632).

Almost surely, 2^91005263 is an apocalyptic number.

91005263 is a deficient number, since it is larger than the sum of its proper divisors (1).

91005263 is an equidigital number, since it uses as much as digits as its factorization.

91005263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 91005263 is about 9539.6678663358. The cubic root of 91005263 is about 449.8028156665.

The spelling of 91005263 in words is "ninety-one million, five thousand, two hundred sixty-three".