90205543 has 2 divisors, whose sum is σ = 90205544. Its totient is φ = 90205542.

The previous prime is 90205541. The next prime is 90205637. The reversal of 90205543 is 34550209.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90205543 - 2¹ = 90205541 is a prime.

Together with 90205541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90205541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45102771 + 45102772.

It is an arithmetic number, because the mean of its divisors is an integer number (45102772).

Almost surely, 2^90205543 is an apocalyptic number.

90205543 is a deficient number, since it is larger than the sum of its proper divisors (1).

90205543 is an equidigital number, since it uses as much as digits as its factorization.

90205543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 90205543 is about 9497.6598696732. The cubic root of 90205543 is about 448.4813713378.

The spelling of 90205543 in words is "ninety million, two hundred five thousand, five hundred forty-three".