90169817 has 2 divisors, whose sum is σ = 90169818. Its totient is φ = 90169816.

The previous prime is 90169771. The next prime is 90169831. The reversal of 90169817 is 71896109.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87310336 + 2859481 = 9344^2 + 1691^2 .

It is a cyclic number.

It is not a de Polignac number, because 90169817 - 2⁸ = 90169561 is a prime.

It is not a weakly prime, because it can be changed into another prime (90169837) 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, 45084908 + 45084909.

It is an arithmetic number, because the mean of its divisors is an integer number (45084909).

Almost surely, 2^90169817 is an apocalyptic number.

It is an amenable number.

90169817 is a deficient number, since it is larger than the sum of its proper divisors (1).

90169817 is an equidigital number, since it uses as much as digits as its factorization.

90169817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 90169817 is about 9495.7789043343. The cubic root of 90169817 is about 448.4221563471.

The spelling of 90169817 in words is "ninety million, one hundred sixty-nine thousand, eight hundred seventeen".