91750091 has 2 divisors, whose sum is σ = 91750092. Its totient is φ = 91750090.

The previous prime is 91750073. The next prime is 91750129. The reversal of 91750091 is 19005719.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91750091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91750391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45875045 + 45875046.

It is an arithmetic number, because the mean of its divisors is an integer number (45875046).

Almost surely, 2^91750091 is an apocalyptic number.

91750091 is a deficient number, since it is larger than the sum of its proper divisors (1).

91750091 is an equidigital number, since it uses as much as digits as its factorization.

91750091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 91750091 is about 9578.6267804942. The cubic root of 91750091 is about 451.0266125236.

The spelling of 91750091 in words is "ninety-one million, seven hundred fifty thousand, ninety-one".