90309533 has 2 divisors, whose sum is σ = 90309534. Its totient is φ = 90309532.

The previous prime is 90309517. The next prime is 90309553. The reversal of 90309533 is 33590309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75394489 + 14915044 = 8683^2 + 3862^2 .

It is a cyclic number.

It is not a de Polignac number, because 90309533 - 2⁴ = 90309517 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90309533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90309553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45154766 + 45154767.

It is an arithmetic number, because the mean of its divisors is an integer number (45154767).

Almost surely, 2^90309533 is an apocalyptic number.

It is an amenable number.

90309533 is a deficient number, since it is larger than the sum of its proper divisors (1).

90309533 is an equidigital number, since it uses as much as digits as its factorization.

90309533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10935, while the sum is 32.

The square root of 90309533 is about 9503.1327992405. The cubic root of 90309533 is about 448.6536433375.

The spelling of 90309533 in words is "ninety million, three hundred nine thousand, five hundred thirty-three".