90163649 has 2 divisors, whose sum is σ = 90163650. Its totient is φ = 90163648.

The previous prime is 90163637. The next prime is 90163669. The reversal of 90163649 is 94636109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88360000 + 1803649 = 9400^2 + 1343^2 .

It is an emirp because it is prime and its reverse (94636109) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90163649 is a prime.

It is not a weakly prime, because it can be changed into another prime (90163669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45081824 + 45081825.

It is an arithmetic number, because the mean of its divisors is an integer number (45081825).

Almost surely, 2^90163649 is an apocalyptic number.

It is an amenable number.

90163649 is a deficient number, since it is larger than the sum of its proper divisors (1).

90163649 is an equidigital number, since it uses as much as digits as its factorization.

90163649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 90163649 is about 9495.4541228948. The cubic root of 90163649 is about 448.4119314514.

The spelling of 90163649 in words is "ninety million, one hundred sixty-three thousand, six hundred forty-nine".