91822985 has 16 divisors (see below), whose sum is σ = 113257872. Its totient is φ = 71424000.

The previous prime is 91822981. The next prime is 91822987. The reversal of 91822985 is 58922819.

It can be written as a sum of positive squares in 8 ways, for example, as 7862416 + 83960569 = 2804^2 + 9163^2 .

It is not a de Polignac number, because 91822985 - 2² = 91822981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91822981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81647 + ... + 82763.

It is an arithmetic number, because the mean of its divisors is an integer number (7078617).

Almost surely, 2^91822985 is an apocalyptic number.

It is an amenable number.

91822985 is a deficient number, since it is larger than the sum of its proper divisors (21434887).

91822985 is a wasteful number, since it uses less digits than its factorization.

91822985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564.

The product of its digits is 103680, while the sum is 44.

The square root of 91822985 is about 9582.4310589745. The cubic root of 91822985 is about 451.1460254150.

It can be divided in two parts, 9182 and 2985, that added together give a cube (12167 = 23³).

The spelling of 91822985 in words is "ninety-one million, eight hundred twenty-two thousand, nine hundred eighty-five".