91495993 has 2 divisors, whose sum is σ = 91495994. Its totient is φ = 91495992.

The previous prime is 91495991. The next prime is 91495997. The reversal of 91495993 is 39959419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78907689 + 12588304 = 8883^2 + 3548^2 .

It is a cyclic number.

It is not a de Polignac number, because 91495993 - 2¹ = 91495991 is a prime.

Together with 91495991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91495991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45747996 + 45747997.

It is an arithmetic number, because the mean of its divisors is an integer number (45747997).

Almost surely, 2^91495993 is an apocalyptic number.

It is an amenable number.

91495993 is a deficient number, since it is larger than the sum of its proper divisors (1).

91495993 is an equidigital number, since it uses as much as digits as its factorization.

91495993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 49.

The square root of 91495993 is about 9565.3537833161. The cubic root of 91495993 is about 450.6098611799.

The spelling of 91495993 in words is "ninety-one million, four hundred ninety-five thousand, nine hundred ninety-three".