91520867 has 2 divisors, whose sum is σ = 91520868. Its totient is φ = 91520866.

The previous prime is 91520837. The next prime is 91520873. The reversal of 91520867 is 76802519.

It is a strong prime.

It is an emirp because it is prime and its reverse (76802519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91520867 - 2¹⁸ = 91258723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91520867.

It is not a weakly prime, because it can be changed into another prime (91520827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45760433 + 45760434.

It is an arithmetic number, because the mean of its divisors is an integer number (45760434).

Almost surely, 2^91520867 is an apocalyptic number.

91520867 is a deficient number, since it is larger than the sum of its proper divisors (1).

91520867 is an equidigital number, since it uses as much as digits as its factorization.

91520867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 91520867 is about 9566.6539082377. The cubic root of 91520867 is about 450.6506915805.

The spelling of 91520867 in words is "ninety-one million, five hundred twenty thousand, eight hundred sixty-seven".