91298087 has 2 divisors, whose sum is σ = 91298088. Its totient is φ = 91298086.

The previous prime is 91298047. The next prime is 91298099. The reversal of 91298087 is 78089219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91298087 - 2¹² = 91293991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91298027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45649043 + 45649044.

It is an arithmetic number, because the mean of its divisors is an integer number (45649044).

Almost surely, 2^91298087 is an apocalyptic number.

91298087 is a deficient number, since it is larger than the sum of its proper divisors (1).

91298087 is an equidigital number, since it uses as much as digits as its factorization.

91298087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 91298087 is about 9555.0032443741. The cubic root of 91298087 is about 450.2847366678.

The spelling of 91298087 in words is "ninety-one million, two hundred ninety-eight thousand, eighty-seven".