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90000991 is a prime number
BaseRepresentation
bin1010101110101…
…00111001011111
320021100112011001
411113110321133
5141020012431
612533011131
72141665363
oct527247137
9207315131
1090000991
1146892093
1226183aa7
1315852532
14bd4b2a3
157d7be61
hex55d4e5f

90000991 has 2 divisors, whose sum is σ = 90000992. Its totient is φ = 90000990.

The previous prime is 90000979. The next prime is 90001003. The reversal of 90000991 is 19900009.

It is a balanced prime because it is at equal distance from previous prime (90000979) and next prime (90001003).

It is an emirp because it is prime and its reverse (19900009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90000991 - 29 = 90000479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90000931) 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, 45000495 + 45000496.

It is an arithmetic number, because the mean of its divisors is an integer number (45000496).

Almost surely, 290000991 is an apocalyptic number.

90000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

90000991 is an equidigital number, since it uses as much as digits as its factorization.

90000991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 90000991 is about 9486.8852106474. The cubic root of 90000991 is about 448.1421194912.

The spelling of 90000991 in words is "ninety million, nine hundred ninety-one", and thus it is an aban number.