91819065 has 16 divisors (see below), whose sum is σ = 158211648. Its totient is φ = 45203136.

The previous prime is 91819051. The next prime is 91819087. The reversal of 91819065 is 56091819.

It is not a de Polignac number, because 91819065 - 2¹² = 91814969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235239 + ... + 235628.

It is an arithmetic number, because the mean of its divisors is an integer number (9888228).

Almost surely, 2^91819065 is an apocalyptic number.

It is an amenable number.

91819065 is a deficient number, since it is larger than the sum of its proper divisors (66392583).

91819065 is a wasteful number, since it uses less digits than its factorization.

91819065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470888.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 91819065 is about 9582.2265157948. The cubic root of 91819065 is about 451.1396053899.

The spelling of 91819065 in words is "ninety-one million, eight hundred nineteen thousand, sixty-five".