91395091 has 2 divisors, whose sum is σ = 91395092. Its totient is φ = 91395090.

The previous prime is 91395089. The next prime is 91395103. The reversal of 91395091 is 19059319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91395091 - 2¹ = 91395089 is a prime.

Together with 91395089, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91395091.

It is not a weakly prime, because it can be changed into another prime (91335091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45697545 + 45697546.

It is an arithmetic number, because the mean of its divisors is an integer number (45697546).

Almost surely, 2^91395091 is an apocalyptic number.

91395091 is a deficient number, since it is larger than the sum of its proper divisors (1).

91395091 is an equidigital number, since it uses as much as digits as its factorization.

91395091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 91395091 is about 9560.0779808535. The cubic root of 91395091 is about 450.4441557071. Note that the first 3 decimals are identical.

The spelling of 91395091 in words is "ninety-one million, three hundred ninety-five thousand, ninety-one".