90641543 has 2 divisors, whose sum is σ = 90641544. Its totient is φ = 90641542.

The previous prime is 90641539. The next prime is 90641557. The reversal of 90641543 is 34514609.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90641543 - 2² = 90641539 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90641503) 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, 45320771 + 45320772.

It is an arithmetic number, because the mean of its divisors is an integer number (45320772).

Almost surely, 2^90641543 is an apocalyptic number.

90641543 is a deficient number, since it is larger than the sum of its proper divisors (1).

90641543 is an equidigital number, since it uses as much as digits as its factorization.

90641543 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 90641543 is about 9520.5852236089. The cubic root of 90641543 is about 449.2027744677.

The spelling of 90641543 in words is "ninety million, six hundred forty-one thousand, five hundred forty-three".