90804889841 has 4 divisors (see below), whose sum is σ = 90805497972. Its totient is φ = 90804281712.

The previous prime is 90804889837. The next prime is 90804889843. The reversal of 90804889841 is 14898840809.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 82601059216 + 8203830625 = 287404^2 + 90575^2 .

It is a cyclic number.

It is not a de Polignac number, because 90804889841 - 2² = 90804889837 is a prime.

It is a super-2 number, since 2×90804889841² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90804889843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91091 + ... + 435783.

It is an arithmetic number, because the mean of its divisors is an integer number (22701374493).

Almost surely, 2^90804889841 is an apocalyptic number.

It is an amenable number.

90804889841 is a deficient number, since it is larger than the sum of its proper divisors (608131).

90804889841 is a wasteful number, since it uses less digits than its factorization.

90804889841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608130.

The product of its (nonzero) digits is 5308416, while the sum is 59.

The spelling of 90804889841 in words is "ninety billion, eight hundred four million, eight hundred eighty-nine thousand, eight hundred forty-one".