90989533 has 2 divisors, whose sum is σ = 90989534. Its totient is φ = 90989532.

The previous prime is 90989527. The next prime is 90989543. The reversal of 90989533 is 33598909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50310649 + 40678884 = 7093^2 + 6378^2 .

It is a cyclic number.

It is not a de Polignac number, because 90989533 - 2¹⁷ = 90858461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90989513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45494766 + 45494767.

It is an arithmetic number, because the mean of its divisors is an integer number (45494767).

Almost surely, 2^90989533 is an apocalyptic number.

It is an amenable number.

90989533 is a deficient number, since it is larger than the sum of its proper divisors (1).

90989533 is an equidigital number, since it uses as much as digits as its factorization.

90989533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 90989533 is about 9538.8433785234. The cubic root of 90989533 is about 449.7768984622.

The spelling of 90989533 in words is "ninety million, nine hundred eighty-nine thousand, five hundred thirty-three".