91930243 has 2 divisors, whose sum is σ = 91930244. Its totient is φ = 91930242.

The previous prime is 91930211. The next prime is 91930253. The reversal of 91930243 is 34203919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91930243 - 2⁵ = 91930211 is a prime.

It is not a weakly prime, because it can be changed into another prime (91930253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45965121 + 45965122.

It is an arithmetic number, because the mean of its divisors is an integer number (45965122).

Almost surely, 2^91930243 is an apocalyptic number.

91930243 is a deficient number, since it is larger than the sum of its proper divisors (1).

91930243 is an equidigital number, since it uses as much as digits as its factorization.

91930243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 91930243 is about 9588.0260220757. The cubic root of 91930243 is about 451.3216175851.

The spelling of 91930243 in words is "ninety-one million, nine hundred thirty thousand, two hundred forty-three".