90159661 has 2 divisors, whose sum is σ = 90159662. Its totient is φ = 90159660.

The previous prime is 90159659. The next prime is 90159673. The reversal of 90159661 is 16695109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88454025 + 1705636 = 9405^2 + 1306^2 .

It is an emirp because it is prime and its reverse (16695109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90159661 - 2¹ = 90159659 is a prime.

Together with 90159659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 90159661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90159631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45079830 + 45079831.

It is an arithmetic number, because the mean of its divisors is an integer number (45079831).

Almost surely, 2^90159661 is an apocalyptic number.

It is an amenable number.

90159661 is a deficient number, since it is larger than the sum of its proper divisors (1).

90159661 is an equidigital number, since it uses as much as digits as its factorization.

90159661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 90159661 is about 9495.2441253503. The cubic root of 90159661 is about 448.4053201649.

The spelling of 90159661 in words is "ninety million, one hundred fifty-nine thousand, six hundred sixty-one".