90643082508281 has 4 divisors (see below), whose sum is σ = 90643254071652. Its totient is φ = 90642910944912.

The previous prime is 90643082508271. The next prime is 90643082508299. The reversal of 90643082508281 is 18280528034609.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66960114263056 + 23682968245225 = 8182916^2 + 4866515^2 .

It is a cyclic number.

It is not a de Polignac number, because 90643082508281 - 2⁴² = 86245035997177 is a prime.

It is a super-2 number, since 2×90643082508281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90643082508211) 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, 84986726 + ... + 86046671.

It is an arithmetic number, because the mean of its divisors is an integer number (22660813517913).

Almost surely, 2^{90643082508281} is an apocalyptic number.

It is an amenable number.

90643082508281 is a deficient number, since it is larger than the sum of its proper divisors (171563371).

90643082508281 is a wasteful number, since it uses less digits than its factorization.

90643082508281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171563370.

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 90643082508281 in words is "ninety trillion, six hundred forty-three billion, eighty-two million, five hundred eight thousand, two hundred eighty-one".