90509423 has 2 divisors, whose sum is σ = 90509424. Its totient is φ = 90509422.

The previous prime is 90509417. The next prime is 90509443. The reversal of 90509423 is 32490509.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90509423 - 2¹⁰ = 90508399 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90509423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90509413) 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, 45254711 + 45254712.

It is an arithmetic number, because the mean of its divisors is an integer number (45254712).

Almost surely, 2^90509423 is an apocalyptic number.

90509423 is a deficient number, since it is larger than the sum of its proper divisors (1).

90509423 is an equidigital number, since it uses as much as digits as its factorization.

90509423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 90509423 is about 9513.6440442136. The cubic root of 90509423 is about 448.9844142188.

The spelling of 90509423 in words is "ninety million, five hundred nine thousand, four hundred twenty-three".