91099387 has 2 divisors, whose sum is σ = 91099388. Its totient is φ = 91099386.

The previous prime is 91099381. The next prime is 91099397. The reversal of 91099387 is 78399019.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91099387 - 2²³ = 82710779 is a prime.

It is not a weakly prime, because it can be changed into another prime (91099381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45549693 + 45549694.

It is an arithmetic number, because the mean of its divisors is an integer number (45549694).

Almost surely, 2^91099387 is an apocalyptic number.

91099387 is a deficient number, since it is larger than the sum of its proper divisors (1).

91099387 is an equidigital number, since it uses as much as digits as its factorization.

91099387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 91099387 is about 9544.5998868470. The cubic root of 91099387 is about 449.9578347323.

It can be divided in two parts, 9109 and 9387, that added together give a square (18496 = 136²).

The spelling of 91099387 in words is "ninety-one million, ninety-nine thousand, three hundred eighty-seven".