90161543 has 2 divisors, whose sum is σ = 90161544. Its totient is φ = 90161542.

The previous prime is 90161531. The next prime is 90161569. The reversal of 90161543 is 34516109.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90161543 - 2⁸ = 90161287 is a prime.

It is a super-3 number, since 3×90161543³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90161573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45080771 + 45080772.

It is an arithmetic number, because the mean of its divisors is an integer number (45080772).

Almost surely, 2^90161543 is an apocalyptic number.

90161543 is a deficient number, since it is larger than the sum of its proper divisors (1).

90161543 is an equidigital number, since it uses as much as digits as its factorization.

90161543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 90161543 is about 9495.3432270772. The cubic root of 90161543 is about 448.4084401594.

The spelling of 90161543 in words is "ninety million, one hundred sixty-one thousand, five hundred forty-three".