90810001809 has 24 divisors (see below), whose sum is σ = 132594014592. Its totient is φ = 59884102080.

The previous prime is 90810001783. The next prime is 90810001831.

90810001809 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 90810001809 - 2²⁴ = 90793224593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90810001879) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 767029 + ... + 877469.

It is an arithmetic number, because the mean of its divisors is an integer number (5524750608).

Almost surely, 2^90810001809 is an apocalyptic number.

It is an amenable number.

90810001809 is a deficient number, since it is larger than the sum of its proper divisors (41784012783).

90810001809 is a wasteful number, since it uses less digits than its factorization.

90810001809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111437 (or 111434 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

It can be divided in two parts, 9081000 and 1809, that added together give a palindrome (9082809).

The spelling of 90810001809 in words is "ninety billion, eight hundred ten million, one thousand, eight hundred nine".