90865811 has 4 divisors (see below), whose sum is σ = 90885624. Its totient is φ = 90846000.

The previous prime is 90865777. The next prime is 90865843. The reversal of 90865811 is 11856809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11856809 = 2557 ⋅4637.

It is a cyclic number.

It is not a de Polignac number, because 90865811 - 2²⁶ = 23756947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90865891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 911 + ... + 13511.

It is an arithmetic number, because the mean of its divisors is an integer number (22721406).

Almost surely, 2^90865811 is an apocalyptic number.

90865811 is a deficient number, since it is larger than the sum of its proper divisors (19813).

90865811 is a wasteful number, since it uses less digits than its factorization.

90865811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19812.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 90865811 is about 9532.3560046822. The cubic root of 90865811 is about 449.5729462910.

The spelling of 90865811 in words is "ninety million, eight hundred sixty-five thousand, eight hundred eleven".