91149287 has 2 divisors, whose sum is σ = 91149288. Its totient is φ = 91149286.

The previous prime is 91149281. The next prime is 91149307. The reversal of 91149287 is 78294119.

It is a weak prime.

It is an emirp because it is prime and its reverse (78294119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91149287 - 2⁴ = 91149271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91149281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45574643 + 45574644.

It is an arithmetic number, because the mean of its divisors is an integer number (45574644).

Almost surely, 2^91149287 is an apocalyptic number.

91149287 is a deficient number, since it is larger than the sum of its proper divisors (1).

91149287 is an equidigital number, since it uses as much as digits as its factorization.

91149287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 91149287 is about 9547.2135725561. The cubic root of 91149287 is about 450.0399750496.

The spelling of 91149287 in words is "ninety-one million, one hundred forty-nine thousand, two hundred eighty-seven".