90543641 has 2 divisors, whose sum is σ = 90543642. Its totient is φ = 90543640.

The previous prime is 90543637. The next prime is 90543643. The reversal of 90543641 is 14634509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75759616 + 14784025 = 8704^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 90543641 - 2² = 90543637 is a prime.

Together with 90543643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90543598 and 90543607.

It is not a weakly prime, because it can be changed into another prime (90543643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45271820 + 45271821.

It is an arithmetic number, because the mean of its divisors is an integer number (45271821).

Almost surely, 2^90543641 is an apocalyptic number.

It is an amenable number.

90543641 is a deficient number, since it is larger than the sum of its proper divisors (1).

90543641 is an equidigital number, since it uses as much as digits as its factorization.

90543641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 90543641 is about 9515.4422388032. The cubic root of 90543641 is about 449.0409881183.

The spelling of 90543641 in words is "ninety million, five hundred forty-three thousand, six hundred forty-one".