91340287 has 2 divisors, whose sum is σ = 91340288. Its totient is φ = 91340286.

The previous prime is 91340261. The next prime is 91340311. The reversal of 91340287 is 78204319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91340287 - 2⁷ = 91340159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91340237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45670143 + 45670144.

It is an arithmetic number, because the mean of its divisors is an integer number (45670144).

Almost surely, 2^91340287 is an apocalyptic number.

91340287 is a deficient number, since it is larger than the sum of its proper divisors (1).

91340287 is an equidigital number, since it uses as much as digits as its factorization.

91340287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 91340287 is about 9557.2112564283. The cubic root of 91340287 is about 450.3541031776.

The spelling of 91340287 in words is "ninety-one million, three hundred forty thousand, two hundred eighty-seven".