91729387 has 2 divisors, whose sum is σ = 91729388. Its totient is φ = 91729386.

The previous prime is 91729357. The next prime is 91729409. The reversal of 91729387 is 78392719.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78392719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91729387 - 2¹⁹ = 91205099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91729357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45864693 + 45864694.

It is an arithmetic number, because the mean of its divisors is an integer number (45864694).

Almost surely, 2^91729387 is an apocalyptic number.

91729387 is a deficient number, since it is larger than the sum of its proper divisors (1).

91729387 is an equidigital number, since it uses as much as digits as its factorization.

91729387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 91729387 is about 9577.5459800515. The cubic root of 91729387 is about 450.9926842831.

The spelling of 91729387 in words is "ninety-one million, seven hundred twenty-nine thousand, three hundred eighty-seven".