91350191 has 2 divisors, whose sum is σ = 91350192. Its totient is φ = 91350190.

The previous prime is 91350167. The next prime is 91350199. The reversal of 91350191 is 19105319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91350191 - 2¹⁸ = 91088047 is a prime.

It is a Sophie Germain prime.

It is equal to p_5290823 and since 91350191 and 5290823 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91350199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45675095 + 45675096.

It is an arithmetic number, because the mean of its divisors is an integer number (45675096).

Almost surely, 2^91350191 is an apocalyptic number.

91350191 is a deficient number, since it is larger than the sum of its proper divisors (1).

91350191 is an equidigital number, since it uses as much as digits as its factorization.

91350191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 91350191 is about 9557.7293851626. The cubic root of 91350191 is about 450.3703798429.

The spelling of 91350191 in words is "ninety-one million, three hundred fifty thousand, one hundred ninety-one".