90169771 has 2 divisors, whose sum is σ = 90169772. Its totient is φ = 90169770.

The previous prime is 90169769. The next prime is 90169817. The reversal of 90169771 is 17796109.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90169771 - 2¹ = 90169769 is a prime.

Together with 90169769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (90169711) 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, 45084885 + 45084886.

It is an arithmetic number, because the mean of its divisors is an integer number (45084886).

Almost surely, 2^90169771 is an apocalyptic number.

90169771 is a deficient number, since it is larger than the sum of its proper divisors (1).

90169771 is an equidigital number, since it uses as much as digits as its factorization.

90169771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 40.

The square root of 90169771 is about 9495.7764822051. The cubic root of 90169771 is about 448.4220800932.

The spelling of 90169771 in words is "ninety million, one hundred sixty-nine thousand, seven hundred seventy-one".