90731112809 has 8 divisors (see below), whose sum is σ = 91672581000. Its totient is φ = 89789769216.

The previous prime is 90731112803. The next prime is 90731112869. The reversal of 90731112809 is 90821113709.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1824571225 + 88906541584 = 42715^2 + 298172^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90731112809 - 2²⁰ = 90730064233 is a prime.

It is a super-3 number, since 3×90731112809³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90731112803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2450567 + ... + 2487315.

It is an arithmetic number, because the mean of its divisors is an integer number (11459072625).

Almost surely, 2^90731112809 is an apocalyptic number.

It is an amenable number.

90731112809 is a deficient number, since it is larger than the sum of its proper divisors (941468191).

90731112809 is a wasteful number, since it uses less digits than its factorization.

90731112809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62299.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 90731112809 in words is "ninety billion, seven hundred thirty-one million, one hundred twelve thousand, eight hundred nine".